ORCID Profile
0000-0002-9628-089X
Current Organisations
University of Technology Sydney
,
Southern Cross University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Geochemistry | Inorganic Geochemistry | Geochemistry not elsewhere classified | Soil Chemistry (excl. Carbon Sequestration Science) | Environmental Chemistry (incl. Atmospheric Chemistry) | Geochemistry Not Elsewhere Classified | Isotope Geochemistry | Other Chemical Sciences | Environmental Rehabilitation (excl. Bioremediation) | Surfacewater Hydrology | Quaternary Environments | Organic Geochemistry | Environmental Chemistry (Incl. Atmospheric Chemistry) | Soil Sciences not elsewhere classified | Food Chemistry and Molecular Gastronomy (excl. Wine) | Earth Sciences Not Elsewhere Classified | Archaeological Science | Geochronology And Isotope Geochemistry | Sedimentology | Environmental Management And Rehabilitation | Structural Biology (incl. Macromolecular Modelling) | Geochronology | Animal Physiological Ecology | Environmental Biotechnology | Soil And Water Sciences Not Elsewhere Classified | Bioremediation | Building Science and Techniques | Palaeoclimatology | Environmental Science and Management | Bioinorganic Chemistry | Construction Materials | Soil Chemistry | Civil Engineering | Structural Chemistry and Spectroscopy | Chemotherapy | Geomorphology and Regolith and Landscape Evolution | Microbial Ecology | Medical Biochemistry and Metabolomics | Ecosystem Function | Chemical Engineering not elsewhere classified | Carbon Sequestration Science | Crop and Pasture Biochemistry and Physiology | Medical Biochemistry: Proteins and Peptides (incl. Medical Proteomics) | Environmental Sciences Not Elsewhere Classified | Medical Biochemistry: Inorganic Elements and Compounds | Analytical Biochemistry | Atomic and Molecular Physics
ANZSRC Socio-Economic Objective (SEO)
Rehabilitation of Degraded Fresh, Ground and Surface Water Environments | Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Physical and Chemical Conditions of Water in Coastal and Estuarine Environments | Coastal and Estuarine Land Management | Coastal and Estuarine Soils | Physical and chemical conditions | Expanding Knowledge in the Earth Sciences | Management of Solid Waste from Mineral Resource Activities | Integrated (ecosystem) assessment and management | Estuarine and lagoon areas | Climate change | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Climate Change Adaptation Measures | Land and water management | Rehabilitation of Degraded Mining Environments | Rehabilitation of Degraded Coastal and Estuarine Environments | Expanding Knowledge in the Environmental Sciences | Coastal and Estuarine Water Management | Management of Liquid Waste from Mineral Resource Activities (excl. Water) | Inorganic Industrial Chemicals | Rehabilitation of degraded coastal and estuarine areas | Environmentally Sustainable Mineral Resource Activities not elsewhere classified | Integrated (ecosystem) assessment and management | Mining and Extraction of Precious (Noble) Metal Ores | Expanding Knowledge in History and Archaeology | Ecosystem Assessment and Management of Farmland, Arable Cropland and Permanent Cropland Environments | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Ecosystem Adaptation to Climate Change | Energy Transformation not elsewhere classified | Climate Change Mitigation Strategies | Urban and Industrial Air Quality | Ecosystem Assessment and Management at Regional or Larger Scales | Cement and Concrete Materials | Marine protected areas | Expanding Knowledge in the Medical and Health Sciences | Mining Soils | Forest and Woodlands Soils | Human Pharmaceutical Treatments (e.g. Antibiotics) | Climate and Climate Change not elsewhere classified | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Expanding Knowledge in the Agricultural and Veterinary Sciences | Expanding Knowledge in the Biological Sciences | Forest and Woodlands Land Management |
Related Links
Publications
Nutrient Leaching in Undisturbed Cores of an Acidic Sandy Podosol Following Simultaneous Potassium Chloride and Di-Ammonium Phosphate Application
Publisher: Springer Science and Business Media LLC
Date: 09-2005
Trace element reactivity in FeS-rich estuarine sediments: Influence of formation environment and acid sulfate soil drainage
Publisher: Elsevier BV
Date: 11-2012
DOI: 10.1016/J.SCITOTENV.2012.08.088
Abstract: Iron monosulfides (FeS) precipitate during benthic mineralisation of organic C and are well known to have a strong influence on trace element bioavailability in sediments. In this study we investigate the reactivity of trace elements (As, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Zn) in sediments containing abundant and persistent FeS stores, collected from a south-western Australian estuarine system. Our objective was to explore the influence of sediment formation conditions on trace element reactivity by investigating sediments collected from different environments, including estuarine, riverine and acid sulfate soil influenced sites, within a single estuarine system. In general, we found a higher degree of reactivity (defined by 1 mol/L HCl extractions) for Cd, Mn, Pb and Zn, compared with a lower reactivity of As, Co, Cr, Cu, Mo and Ni. Moderate to strong correlations (R(2)>0.4, P<0.05) were observed between AVS and reactive Cd, Co, Mn, Mo, Ni, Pb and Zn within many of the formation environments. In contrast, correlations between AVS and As, Cr and Cu were generally poor (not significant, R(2) 0.05). Based on their reactivity and correlations with AVS, it appears that interactions (sorption, co-precipitation) between FeS and Cd, Mn, Pb and Zn in many of the sediments from this study are probable. Our data also demonstrate that drainage from acid sulfate soils (ASS) can be a source of trace elements at specific sites. A principal components analysis of our reactive (1 mol/L HCl extractable) trace element data clearly distinguished sites receiving ASS drainage from the other non-impacted sites, by a high contribution from Fe-Co-Mn-Ni along the first principal axis, and contributions from higher S-As/lower reactive Pb along the second axis. This demonstrates that trace element reactivity in sediments may provide a geochemical signature for sites receiving ASS drainage.
Estimating sludge loadings to land based on trace metal sorption in soil: effect of dissolved organo-metallic complexes
Publisher: Elsevier BV
Date: 03-2003
Reduced Inorganic Sulfur Speciation in Drain Sediments from Acid Sulfate Soil Landscapes
Publisher: American Chemical Society (ACS)
Date: 27-12-2005
DOI: 10.1021/ES0516763
Abstract: We examined processes regulating reduced inorganic sulfur (RIS) speciation in drain sediments from coastal acid sulfate soil (ASS) landscapes. Pore water sulfide was undetectable or present at low levels (0.6-18.8 microM), consistent with FeS(s) precipitation in the presence of high concentrations of Fe2+ (generally >2 mM). Acid-volatile sulfide (AVS), with concentrations up to 1019 micromol g(-1), comprised a major proportion of RIS. The AVS to pyrite-S ratios were up to 2.6 in sediment profiles containing abundant reactive Fe (up to approximately 4000 micromol g(-1)). Such high AVS:pyrite-S ratios are indicative of inefficient conversion of FeS(s) to pyrite. This may be due to low pore water sulfide levels causing slow rates of pyrite formation via the polysulfide and H2S oxidation pathways. Overall, RIS speciation in ASS-associated drain sediments is unique and is largely regulated by abundant reactive Fe.
Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments
Publisher: American Chemical Society (ACS)
Date: 29-11-2022
Abstract: This study examines incorporation of Sb(V) into schwertmannite─an Fe(III) oxyhydroxysulfate mineral that can be an important Sb host phase in acidic environments. Schwertmannite was synthesized from solutions containing a range of Sb(V)/Fe(III) ratios, and the resulting solids were investigated using geochemical analysis, powder X-ray diffraction (XRD), dissolution kinetic experiments, and extended X-ray absorption fine structure (EXAFS) spectroscopy. Shell-fitting and wavelet transform analyses of Sb K-edge EXAFS data, together with congruent Sb and Fe release during schwertmannite dissolution, indicate that schwertmannite incorporates Sb(V) via heterovalent substitution for Fe(III). Elemental analysis combined with XRD and Fe K-edge EXAFS spectroscopy shows that schwertmannite can incorporate Sb(V) via this mechanism at up to about 8 mol % substitution when formed from solutions having Sb/Fe ratios ≤0.04 (higher ratios inhibit schwertmannite formation). Incorporation of Sb(V) into schwertmannite involves formation of edge and double-corner sharing linkages between Sb
Manganese accumulation and solid-phase speciation in a 3.5 m thick mud sequence from the estuary of an acidic and Mn-rich creek, northern Baltic Sea
Publisher: Elsevier BV
Date: 10-2016
Factors Controlling the Geochemical Partitioning of Trace Metals in Estuarine Sediments
Publisher: Informa UK Limited
Date: 07-2006
Seawater causes rapid trace metal mobilisation in coastal lowland acid sulfate soils: Implications of sea level rise for water quality
Publisher: Elsevier BV
Date: 12-2010
Reductive transformation of iron and sulfur in schwertmannite-rich accumulations associated with acidified coastal lowlands
Publisher: Elsevier BV
Date: 09-2007
Elemental sulfur in drain sediments associated with acid sulfate soils
Publisher: Elsevier BV
Date: 07-2006
Chromium(VI) removal by siderite (FeCO3) in anoxic aqueous solutions: An X-ray absorption spectroscopy investigation
Publisher: Elsevier BV
Date: 11-2018
DOI: 10.1016/J.SCITOTENV.2018.06.003
Abstract: Chromium(VI) is an environmental contaminant of priority concern, which can be treated by reduction of toxic Cr(VI) to non-toxic Cr(III). Siderite (FeCO
Arsenic solid-phase speciation in an alluvial aquifer system adjacent to the Himalayan forehills, Nepal
Publisher: Elsevier BV
Date: 12-2015
Iron-sulfide and trace element behaviour in sediments of Coombabah Lake, southern Moreton Bay (Australia)
Publisher: Elsevier BV
Date: 07-2008
Pore Water Sampling in Acid Sulfate Soils: A New Peeper Method
Publisher: Wiley
Date: 11-2009
DOI: 10.2134/JEQ2009.0135
Abstract: This study describes the design, deployment, and application of a modified equilibration dialysis device (peeper) optimized for s ling pore waters in acid sulfate soils (ASS). The modified design overcomes the limitations of traditional-style peepers, when s ling firm ASS materials over relatively large depth intervals. The new peeper device uses removable, in idual cells of 25 mL volume housed in a 1.5 m long rigid, high-density polyethylene rod. The rigid housing structure allows the device to be inserted directly into relatively firm soils without requiring a supporting frame. The use of removable cells eliminates the need for a large glove-box after peeper retrieval, thus simplifying physical handling. Removable cells are easily maintained in an inert atmosphere during s le processing and the 25-mL s le volume is sufficient for undertaking multiple analyses. A field evaluation of equilibration times indicates that 32 to 38 d of deployment was necessary. Overall, the modified method is simple and effective and well suited to acquisition and processing of redox-sensitive pore water profiles>1 m deep in acid sulfate soil or any other firm wetland soils.
Arsenic Mobilization in a Seawater Inundated Acid Sulfate Soil
Publisher: American Chemical Society (ACS)
Date: 15-02-2010
DOI: 10.1021/ES903114Z
Abstract: Tidal seawater inundation of coastal acid sulfate soils can generate Fe- and S0(4)-reducing conditions in previously oxic-acidic sediments. This creates potential for mobilization of As during the redox transition. We explore the consequences for As by investigating the hydrology, porewater geochemistry, solid-phase speciation, and mineralogical partitioning of As across two tidal fringe toposequences. Seawater inundation induced a tidally controlled redox gradient Maximum porewater As (~400 μg/L) occurred in the shallow (<1 m), intertidal, redox transition zone between Fe-oxidizing and S0(4)-reducing conditions. Primary mechanisms of As mobilization include the reduction of solid-phase As(V) to As(lll), reductive dissolution of As(V)-bearing secondary Fe(lll) minerals and competitive anion desorption. Porewater As concentrations decreased in the zone of contemporary pyrite reformation. Oscillating hydraulic gradients caused by tidal pumping promote upward advection of As and Fe(2+)-enriched porewater in the intertidal zone, leading to accumulation of As(V)-enriched Fe(lll) (hydr)oxides at the oxic sediment-water interface. While this provides a natural reactive-Fe barrier, it does not completely retard the flux of porewater As to overtopping surface waters. Furthermore, the accumulated Fe minerals may be prone to future reductive dissolution. A conceptual model describing As hydro-geochemical coupling across an intertidal fringe is presented.
Antimony and arsenic partitioning during Fe2+ -induced transformation of jarosite under acidic conditions
Publisher: Elsevier BV
Date: 03-2018
DOI: 10.1016/J.CHEMOSPHERE.2017.12.106
Abstract: Jarosite [KFe
Phosphorus release from coastal sediments: Impacts of the oxidation-reduction potential and sulfide
Publisher: Elsevier BV
Date: 12-2016
DOI: 10.1016/J.MARPOLBUL.2016.09.007
Abstract: The release of phosphorus (P) from benthic sediments can affect the P content, nutrient status and quality of overlying waters in coastal ecosystem. This study was carried out to investigate the influence of oxidation-reduction potential (ORP) and sulfide on P release from sediments in the coastal estuary of the Yuniao River, China. The results showed that ferric iron-bound P was the main P burial phase in the sediments. The P concentration in overlying water increased with ORP decrease and sulfide increase, displaying a significant linear correlation with the ORP and sulfide concentration. The results indicate that decreased ORP may elevate the zero equilibrium phosphorus concentration, enhancing the capability of P release. And increased sulfide may react or capture reactive iron in sediments, reducing the P adsorption capacity and accelerating P release. Therefore, the control of ORP and sulfide production is important in the sink/source conversion of P in coastal sediments.
Antimony mobility in reducing environments: The effect of microbial iron(III)-reduction and associated secondary mineralization
Publisher: Elsevier BV
Date: 2019
Impact of Antimony(V) on Iron(II)-Catalyzed Ferrihydrite Transformation Pathways: A Novel Mineral Switch for Feroxyhyte Formation
Publisher: American Chemical Society (ACS)
Date: 12-03-2021
Enrichment and fractionation of rare earth elements in FeS- and organic-rich estuarine sediments receiving acid sulfate soil drainage
Publisher: Elsevier BV
Date: 05-2012
Acid-Volatile Sulfide Oxidation in Coastal Flood Plain Drains: Iron−Sulfur Cycling and Effects on Water Quality
Publisher: American Chemical Society (ACS)
Date: 20-01-2006
DOI: 10.1021/ES0520058
Abstract: The effect of acid-volatile sulfide (AVS) oxidation on Fe-S cycling and water quality in coastal flood plain drains from acid-sulfate soil landscapes was examined using natural sediments and synthetic iron monosulfide. Oxidation of AVS occurred rapidly (half-time < or = 1 h) and produced elemental sulfur (S8(0)(s)) and iron oxyhydroxide (FeOOH(s)). The initial rapid AVS oxidation process occurred without significant acidification or changes to the aqueous-phase composition. Severe acidification (pH < 4) occurred only once S8(0)(s) began to oxidize to SO4 (within 2-3 days of the initial AVS oxidation). Our results demonstrate, for the first time with natural sediments, a significant pH-buffered (near-neutral) AVS oxidation step with the trigger to acidification being the oxidation of S8(0)(s). Acidification resulted in the pH-dependent release of large amounts of Al, Mn, Ni, and Zn even though the sediment metal content was low.
Schwertmannite: A review of its occurrence, formation, structure, stability and interactions with oxyanions
Publisher: Elsevier BV
Date: 10-2021
A sequential extraction procedure for acid sulfate soils: Partitioning of iron
Publisher: Elsevier BV
Date: 03-2010
Microbial sulfidogenesis in ferrihydrite-rich environments: Effects on iron mineralogy and arsenic mobility
Publisher: Elsevier BV
Date: 06-2011
Sedimentary iron–phosphorus cycling under contrasting redox conditions in a eutrophic estuary
Publisher: Elsevier BV
Date: 2015
Acidity fractions in acid sulfate soils and sediments: contributions of schwertmannite and jarosite
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/SR12291
Abstract: In Australia, the assessment of acidity hazard in acid sulfate soils requires the estimation of operationally defined acidity fractions such as actual acidity, potential sulfidic acidity, and retained acidity. Acid–base accounting approaches in Australia use these acidity fractions to estimate the net acidity of acid sulfate soils materials. Retained acidity is the acidity stored in the secondary Fe/Al hydroxy sulfate minerals, such as jarosite, natrojarosite, schwertmannite, and basaluminite. Retained acidity is usually measured as either net acid-soluble sulfur (SNAS) or residual acid soluble sulfur (SRAS). In the present study, contributions of schwertmannite and jarosite to the retained acidity, actual acidity, and potential sulfidic acidity fractions were systematically evaluated using SNAS and SRAS techniques. The data show that schwertmannite contributed considerably to the actual acidity fraction and that it does not contribute solely to the retained acidity fraction as has been previously conceptualised. As a consequence, SNAS values greatly underestimated the schwertmannite content. For soil s les in which jarosite is the only mineral present, a better estimate of the added jarosite content can be obtained by using a correction factor of 2 to SNAS values to account for the observed 50–60% recovery. Further work on a broader range of jarosite s les is needed to determine whether this correction factor has broad applicability. The SRAS was unable to reliably quantify either the schwertmannite or the jarosite content and, therefore, is not suitable for quantification of the retained acidity fraction. Potential sulfidic acidity in acid sulfate soils is conceptually derived from reduced inorganic sulfur minerals and has been estimated by the peroxide oxidation approach, which is used to derive the SRAS values. However, both schwertmannite and jarosite contributed to the peroxide-oxidisable sulfur fraction, implying a major potential interference by those two minerals to the determination of potential sulfidic acidity in acid sulfate soils through the peroxide oxidation approach.
Phosphate-Imposed Constraints on Schwertmannite Stability under Reducing Conditions
Publisher: American Chemical Society (ACS)
Date: 17-08-2017
Abstract: Schwertmannite is a ferric oxyhydroxysulfate mineral, which is common in acid sulfate systems. Such systems contain varying concentrations of phosphate (PO
Seasonal temperature oscillations drive contrasting Arsenic and Antimony mobilisation in a mining‐impacted river system
Publisher: American Geophysical Union (AGU)
Date: 10-2020
DOI: 10.1029/2020WR028196
Abstract: Arsenic (As) and antimony (Sb) speciation and mobility in river systems can be influenced by the redox conditions of benthic and hyporheic zone sediments. However, our understanding of how temperature fluctuations influence riverine As and Sb mobility over diel and seasonal time frames, via moderation of sediment redox conditions, is poorly constrained. Here we compare diel and seasonal water quality data from a river system contaminated with As and Sb with results from sediment‐water incubations conducted at temperatures spanning 8°C to 32°C under low‐dissolved oxygen conditions. Higher incubation temperatures caused faster microbial respiration, lower redox potential, and greater As aq concentrations, coincident with reduction of As(V), Mn (III/IV), Fe (III), and SO 4 2− . Initial rates of As 3+ aq formation increased exponentially with temperature ( Q 10 = 3.3 ± 0.5) and were positively correlated with microbial respiration ( r 2 = 0.99, P 0.01). In contrast, Sb aq displayed an initially negative and comparatively weak overall temperature dependence during incubations. In river waters, diel mobilization of reduced species (As 3+ aq and Fe 2+ aq ) and contrasting attenuation of Sb was coincident with lower redox potential during nightly respiration cycles. Distinct seasonal oscillations in river water As aq were exponentially correlated with temperature ( r 2 = 0.68, P 0.01), whereas Sb aq was not. These characteristics reflect the fundamental role of anaerobic metabolism (as influenced by temperature) within benthic and hyporheic zone sediments as a key driver of contrasting riverine As and Sb mobility. The findings imply that riverine As mobility may be enhanced, while Sb mobility possibly attenuated, by eutrophication or by elevated stream temperatures due to a warming climate.
Impact of silica on the reductive transformation of schwertmannite and the mobilization of arsenic
Publisher: Elsevier BV
Date: 11-2012
Anthropogenic forcing of estuarine hypoxic events in sub-tropical catchments: Landscape drivers and biogeochemical processes
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.SCITOTENV.2011.08.065
Abstract: Episodic hypoxic events can occur following summer floods in sub-tropical estuaries of eastern Australia. These events can cause deoxygenation of waterways and extensive fish mortality. Here, we present a conceptual model that links key landscape drivers and biogeochemical processes which contribute to post-flood hypoxic events. The model provides a framework for examining the nature of anthropogenic forcing. Modification of estuarine floodplain surface hydrology through the construction of extensive drainage networks emerges as a major contributing factor to increasing the frequency, magnitude and duration of hypoxic events. Forcing occurs in two main ways. Firstly, artificial drainage of backsw wetlands initiates drier conditions which cause a shift in vegetation assemblages from wetland-dominant species to dryland-dominant species. These species, which currently dominate the floodplain, are largely intolerant of inundation and provide abundant labile substrate for decomposition following flood events. Decomposition of this labile carbon pool consumes oxygen in the overlying floodwaters, and results in anoxic conditions and waters with excess deoxygenation potential (DOP). Carbon metabolism can be strongly coupled with microbially-mediated reduction of accumulated Fe and Mn oxides, phases which are common on these coastal floodplain landscapes. Secondly, artificial drainage enhances discharge rates during the flood recession phase. Drains transport deoxygenated high DOP floodwaters rapidly from backsw wetlands to the main river channel to further consume oxygen. This process effectively displaces the natural carbon metabolism processes from floodplain wetlands to the main channel. Management options to reduce the impacts of post-flood hypoxia include i) remodifying drainage on the floodplain to promote wetter conditions, thereby shifting vegetation assemblages towards inundation-tolerant species, and ii) strategic retention of floodwaters in the backsw wetlands to reduce the volume and rate during the critical post-flood recession phase.
Monosulfidic black ooze accumulations in sediments of the Geographe Bay area, Western Australia
Publisher: Elsevier BV
Date: 11-2010
DOI: 10.1016/J.MARPOLBUL.2010.07.029
Abstract: Mobilisation of sedimentary monosulfidic black ooze (MBO) may result in rapid deoxygenation and acidification of surface waters, and release of potentially toxic metals. This study examines the extent and nature of MBO accumulation in the Geographe Bay area, Western Australia. MBO accumulations were found to be widespread in benthic sediments of the Geographe Bay area with acid-volatile sulfide (AVS) contents as high as 320 μmol g(-1). The MBO materials often had unusually high dissolved sulfide (S(-II)) concentrations in their pore-waters (up to 610 mg L(-1)) and elevated elemental sulfur (S(0)) contents (up to 51 μmol g(-1)). Dissolved S(-II) is able to accumulate due to limited iron availability and S(0) is largely its partial oxidation product. The availability of organic carbon and Fe limited MBO accumulation at many sites. A comparison of AVS and simultaneously extracted metal (SEM) concentrations has shown that metals are likely to be bound in sulfide complexes.
Reactive trace element enrichment in a highly modified, tidally inundated acid sulfate soil wetland: East Trinity, Australia
Publisher: Elsevier BV
Date: 04-2010
DOI: 10.1016/J.MARPOLBUL.2010.02.006
Abstract: This study examines the abundance of trace elements in surface sediments of a former acid sulfate soil (ASS) wetland subjected to marine tidal inundation. Sediment properties of this highly modified study site are compared with those of an adjacent unmodified, intertidal mangrove forest. Whilst some trace elements (Al, Cd, Mn, Ni and Zn) were clearly depleted due to mobilisation and leaching in the previous oxic-acidic phase, other trace elements (As and Cr) displayed significant enrichment in the tidally inundated ASS. Many trace elements were strongly associated with the reactive Fe and acid volatile sulfide (AVS) fractions, suggesting that trace elements may be adsorbed to abundant reactive Fe phases or sequestered as sulfide minerals. These findings provide an important understanding of the fate and mobility of reactive iron, AVS and trace elements during tidal remediation of a formerly acidified Great Barrier Reef (GBR) catchment.
Arsenic mobilization and iron transformations during sulfidization of As(V)-bearing jarosite
Publisher: Elsevier BV
Date: 12-2012
Effect of cyclic redox oscillations on water quality in freshwater acid sulfate soil wetlands
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.SCITOTENV.2016.12.131
Abstract: Restoration of acid sulfate soil (ASS) wetlands by freshwater re-flooding can lead to the reformation of various Fe(II) and reduced inorganic sulfur (RIS) species in surface soil layers. However, in many locations, wetland water levels undergo large seasonal fluctuations that drive extreme redox oscillations. Newly formed RIS species [e.g. greigite, mackinawite, nano-pyrite and S(0)] and Fe(II) are vulnerable to rapid oxidation during dry periods and may generate substantial acidity. Rainfall following a dry period may then mobilise acidity and metal cations in surface waters prior to eventual recovery in pH by re-establishment of reducing conditions. We explore this dry-wet transition by subjecting soil s les from two freshwater re-flooded ASS wetlands to oxidative incubation for up to 130days followed by re-flooding simulation for 84days. During very early stages of re-flooding (up to 7days) there was an initial pulse-release of acidity, and trace metals/metalloids (Al, Mn, Zn and As). This was followed by a rapid reversion to anoxia, and Fe(III) and SO
Abundance and fractionation of Al, Fe and trace metals following tidal inundation of a tropical acid sulfate soil
Publisher: Elsevier BV
Date: 03-2010
Reactive sulfide relationships with trace metal extractability in sediments from southern Moreton Bay, Australia
Publisher: Elsevier BV
Date: 05-2005
Liberation of acidity and arsenic from schwertmannite: Effect of fulvic acid
Publisher: Elsevier BV
Date: 04-2014
Improved identification of sulfidic soil materials by a modified incubation method
Publisher: Elsevier BV
Date: 02-2009
Arsenic(V) sorption kinetics in long-term arsenic pesticide contaminated soils
Publisher: Elsevier BV
Date: 12-2019
Landslide-induced iron mobilisation shapes benthic accumulation of nutrients, trace metals and REE fractionation in an oligotrophic alpine stream
Publisher: Elsevier BV
Date: 2015
Iron geochemical zonation in a tidally inundated acid sulfate soil wetland
Publisher: Elsevier BV
Date: 2011
Arsenic Effects and Behavior in Association with the Fe(II)-Catalyzed Transformation of Schwertmannite
Publisher: American Chemical Society (ACS)
Date: 11-02-2010
DOI: 10.1021/ES903424H
Abstract: In acid-mine drainage and acid-sulfate soil environments, the cycling of Fe and As are often linked to the formation and fate of schwertmannite (Fe(8)O(8)(OH)(8-2x)(SO(4))(x)). When schwertmannite-rich material is subjected to near-neutral Fe(III)-reducing conditions (e.g., in reflooded acid-sulfate soils or mining-lake sediments), the resulting Fe(II) can catalyze transformation of schwertmannite to goethite. This work examines the effects of arsenic(V) and arsenic(III) on the Fe(II)-catalyzed transformation of schwertmannite and investigates the associated consequences of this mineral transformation for arsenic mobilization. A series of 9-day anoxic transformation experiments were conducted with synthetic schwertmannite and various additions of Fe(II), As(III), and As(V). X-ray diffraction (XRD) and Fe K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy demonstrated that, in the absence of Fe(II), schwertmannite persisted as the dominant mineral phase. Under arsenic-free conditions, 10 mM Fe(II) catalyzed rapid and complete transformation of schwertmannite to goethite. However, the magnitude of Fe(II)-catalyzed transformation decreased to 72% in the presence of 1 mM As(III) and to only 6% in the presence of 1 mM As(V). This partial Fe(II)-catalyzed transformation of As(III)-sorbed schwertmannite did not cause considerable As(III) desorption. In contrast, the formation of goethite via partial transformation of As(III)- and As(V)-sorbed schwertmannite significantly decreased arsenic mobilization under Fe(III)-reducing conditions. This implies that the Fe(II)-catalyzed transformation of schwertmannite to goethite may help to stabilize solid-phase arsenic and retard its subsequent release to groundwater.
Metal partitioning dynamics during the oxidation and acidification of sulfidic soil
Publisher: Elsevier BV
Date: 05-2011
Iron monosulfide accumulation and pyrite formation in eutrophic estuarine sediments
Publisher: Elsevier BV
Date: 12-2013
Mobility of arsenic and selected metals during re-flooding of iron- and organic-rich acid-sulfate soil
Publisher: Elsevier BV
Date: 07-2008
Antimony Sorption to Goethite: Effects of Fe(II)-Catalyzed Recrystallization
Publisher: American Chemical Society (ACS)
Date: 17-02-2020
Partitioning of metals in a degraded acid sulfate soil landscape: Influence of tidal re-inundation
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.CHEMOSPHERE.2011.07.013
Abstract: The oxidation and acidification of sulfidic soil materials results in the re-partitioning of metals, generally to more mobile forms. In this study, we examine the partitioning of Fe, Cr, Cu, Mn, Ni and Zn in the acidified surface soil (0-0.1 m) and the unoxidised sub-soil materials (1.3-1.5 m) of an acid sulfate soil landscape. Metal partitioning at this acidic site was then compared to an adjacent site that was previously acidified, but has since been remediated by tidal re-inundation. Differences in metal partitioning were determined using an optimised six-step sequential extraction procedure which targets the "labile", "acid-soluble", "organic", "crystalline oxide", "pyritic" and "residual" fractions. The surficial soil materials of the acidic site had experienced considerable losses of Cr, Cu, Mn and Ni compared to the underlying parent material due to oxidation and acidification, yet only minor losses of Fe and Zn. In general, the metals most depleted from the acidified surface soil materials exhibited the greatest sequestration in the surface soil materials of the tidally remediated site. An exception to this was iron, which accumulated to highly elevated concentrations in the surficial soil materials of the tidally remediated site. The "acid-soluble", "organic" and "pyritic" fractions displayed the greatest increase in metals following tidal remediation. This study demonstrates that prolonged tidal re-inundation of severely acidified acid sulfate soil landscapes leads to the immobilisation of trace metals through the surficial accumulation of iron oxides, organic material and pyrite.
Correction to Vanadium Speciation in Ancient Shales Revealed through Synchrotron-Based X-ray Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 24-02-2023
Water chemistry and nutrient release during the resuspension of FeS-rich sediments in a eutrophic estuarine system
Publisher: Elsevier BV
Date: 08-2012
DOI: 10.1016/J.SCITOTENV.2012.05.065
Abstract: The objective of this study was to investigate the impact of resuspending FeS-rich benthic sediment on estuarine water chemistry. To address this objective, we conducted (1) a series of laboratory-based sediment resuspension experiments and (2) also monitored changes in surface water composition during field-based sediment resuspension events that were caused by dredging activities in the Peel-Harvey Estuary, Western Australia. Our laboratory resuspension experiments showed that the resuspension of FeS-rich sediments rapidly deoxygenated estuarine water. In contrast, dredging activities in the field did not noticeably lower O(2) concentrations in adjacent surface water. Additionally, while FeS oxidation in the laboratory resuspensions caused measurable decreases in pH, the field pH was unaffected by the dredging event and dissolved trace metal concentrations remained very low throughout the monitoring period. Dissolved ammonium (NH(4)(+)) and inorganic phosphorus (PO(4)-P) were released into the water column during the resuspension of sediments in both the field and laboratory. Following its initial release, PO(4)-P was rapidly removed from solution in the laboratory-based (<1h) and field-based (<100 m from sediment disposal point) investigations. In comparison to PO(4)-P, NH(4)(+) release was observed to be more prolonged over the 2-week period of the laboratory resuspension experiments. However, our field-based observations revealed that elevated NH(4)(+) concentrations were localised to <100 m from the sediment disposal point. This study demonstrates that alongside the emphasis on acidification, deoxygenation and metal release during FeS resuspension, it is important to consider the possibility of nutrient release from disturbed sediments in eutrophic estuaries.
A new pathway for hexavalent chromium formation in soil: Fire-induced alteration of iron oxides
Publisher: Elsevier BV
Date: 04-2019
DOI: 10.1016/J.ENVPOL.2019.01.094
Abstract: Iron oxides are important pedogenic Cr(III)-bearing phases which experience high-temperature alteration via fire-induced heating of surface soil. In this study, we examine if heating-induced alteration of Cr(III)-substituted Fe oxides can potentially facilitate rapid high-temperature oxidation of solid-phase Cr(III) to hazardous Cr(VI). Synthetic Cr(III)-substituted ferrihydrite, goethite and hematite were heated up to 800 °C for 2 h. Corresponding heating experiments were also conducted on an unpolluted Ferrosol-type soil, which had a total Cr content of 220 mg kg
Sulfate Availability Drives Divergent Evolution of Arsenic Speciation during Microbially Mediated Reductive Transformation of Schwertmannite
Publisher: American Chemical Society (ACS)
Date: 15-02-2013
DOI: 10.1021/ES303867T
Abstract: The effect of SO4(2-) availability on the microbially mediated reductive transformation of As(V)-coprecipitated schwertmannite (Fe8O8(OH)3.2(SO4)2.4(AsO4)0.004) was examined in long-term (up to 400 days) incubation experiments. Iron EXAFS spectroscopy showed siderite (FeCO3) and mackinawite (FeS) were the dominant secondary Fe(II) minerals produced via reductive schwertmannite transformation. In addition, ∼ 25% to ∼ 65% of the initial schwertmannite was also transformed relatively rapidly to goethite (αFeOOH), with the extent of this transformation being dependent on SO4(2-) concentrations. More specifically, the presence of high SO4(2-) concentrations acted to stabilize schwertmannite, retarding its transformation to goethite and allowing its partial persistence over the 400 day experiment duration. Elevated SO4(2-) also decreased the extent of dissimilatory reduction of Fe(III) and As(V), instead favoring dissimilatory SO4(2-) reduction. In contrast, where SO4(2-) was less available, there was near-complete reduction of schwertmannite- and goethite-derived Fe(III) as well as solid-phase As(V). As a result, under low SO4(2-) conditions, almost no Fe(III) or As(V) remained toward the end of the experiment and arsenic solid-phase partitioning was controlled mainly by sorptive interactions between As(III) and mackinawite. These As(III)-mackinawite interactions led to the formation of an orpiment (As2S3)-like species. Interestingly, this orpiment-like arsenic species did not form under SO4(2-)-rich conditions, despite the prevalence of dissimilatory SO4(2-) reduction. The absence of an arsenic sulfide species under SO4(2-)-rich conditions appears to have been a consequence of schwertmannite persistence, combined with the preferential retention of arsenic oxyanions by schwertmannite. The results highlight the critical role that SO4(2-) availability can play in controlling solid-phase arsenic speciation, particularly arsenic-sulfur interactions, under reducing conditions in soils, sediments, and shallow groundwater systems.
Sulfur biogeochemical cycling and novel Fe–S mineralization pathways in a tidally re-flooded wetland
Publisher: Elsevier BV
Date: 06-2011
Trace Metal Distribution and Enrichment in Benthic, Estuarine Sediments: Southport Broadwater, Australia
Publisher: Springer Science and Business Media LLC
Date: 12-2005
DOI: 10.1007/S10653-004-7086-X
Abstract: The distribution and enrichment of selected trace metals (Cd, Cr, Cu, Ni, Pb, Sn, Zn) in benthic sediments of the Southport Broadwater, a semi-enclosed coastal body of water adjacent to the Gold Coast city, south-eastern Queensland, Australia, was studied with the objective of assessing the extent and degree of sediment contamination. Sediment s les from the 0-10 cm and 10-20 cm depth intervals of 32 sites within the Southport Broadwater and surrounding residential canals were analysed for particle size distribution, pH, organic C and 'near-total' major (Al, Ca, Fe, Mn) and trace (Cd, Cr, Cu, Ni, Pb, Sn, Zn) metal contents. Sediment contamination for each trace metal was assessed by (1) comparison with Australian sediment quality guidelines, (2) calculation of the index of geoaccumulation based on regional background values, and (3) geochemical normalisation against Al (i.e. the abundance of alumino-silicate clay minerals). Based on this approach, the results indicate that submerged sediments in the study area are not presently enriched with Cd, Cr or Ni, with the spatial distribution of these metals being very well explained by the abundance of alumino-silicate clay minerals. However, several sites were strongly enriched with Cu, Pb, Sn and Zn, arising from sources related to either urban runoff or vessel maintenance activities. The study indicates that several varying approaches are needed for a satisfactory assessment of contaminant enrichment in estuarine sediments.
Iron and Arsenic Cycling in Intertidal Surface Sediments during Wetland Remediation
Publisher: American Chemical Society (ACS)
Date: 15-02-2011
DOI: 10.1021/ES103403N
Abstract: The accumulation and behavior of arsenic at the redox interface of Fe-rich sediments is strongly influenced by Fe(III) precipitate mineralogy, As speciation, and pH. In this study, we examined the behavior of Fe and As during aeration of natural groundwater from the intertidal fringe of a wetland being remediated by tidal inundation. The groundwater was initially rich in Fe(2+) (32 mmol L(-1)) and As (1.81 μmol L(-1)) with a circum-neutral pH (6.05). We explore changes in the solid/solution partitioning, speciation and mineralogy of Fe and As during long-term continuous groundwater aeration using a combination of chemical extractions, SEM, XRD, and synchrotron XAS. Initial rapid Fe(2+) oxidation led to the formation of As(III)-bearing ferrihydrite and sorption of >95% of the As(aq) within the first 4 h of aeration. Ferrihydrite transformed to schwertmannite within 23 days, although sorbed/coprecipitated As(III) remained unoxidized during this period. Schwertmannite subsequently transformed to jarosite at low pH (2-3), accompanied by oxidation of remaining Fe(2+). This coincided with a repartitioning of some sorbed As back into the aqueous phase as well as oxidation of sorbed/coprecipitated As(III) to As(V). Fe(III) precipitates formed via groundwater aeration were highly prone to reductive dissolution, thereby posing a high risk of mobilizing sorbed/coprecipitated As during any future upward migration of redox boundaries. Longer-term investigations are warranted to examine the potential pathways and magnitude of arsenic mobilization into surface waters in tidally reflooded wetlands.
Arsenic Mobility during Flooding of Contaminated Soil: The Effect of Microbial Sulfate Reduction
Publisher: American Chemical Society (ACS)
Date: 12-11-2014
DOI: 10.1021/ES503963K
Abstract: In floodplain soils, As may be released during flooding-induced soil anoxia, with the degree of mobilization being affected by microbial redox processes such as the reduction of As(V), Fe(III), and SO4(2-). Microbial SO4(2-) reduction may affect both Fe and As cycling, but the processes involved and their ultimate consequences on As mobility are not well understood. Here, we examine the effect of microbial SO4(2) reduction on solution dynamics and solid-phase speciation of As during flooding of an As-contaminated soil. In the absence of significant levels of microbial SO4(2-) reduction, flooding caused increased Fe(II) and As(III) concentrations over a 10 week period, which is consistent with microbial Fe(III)- and As(V)-reduction. Microbial SO4(2-) reduction leads to lower concentrations of porewater Fe(II) as a result of FeS formation. Scanning electron microscopy with energy dispersive X-ray fluorescence spectroscopy revealed that the newly formed FeS sequestered substantial amounts of As. Bulk and microfocused As K-edge X-ray absorption near-edge structure spectroscopy confirmed that As(V) was reduced to As(III) and showed that in the presence of FeS, solid-phase As was retained partly via the formation of an As2S3-like species. High resolution transmission electron microscopy suggested that this was due to As retention as an As2S3-like complex associated with mackinawite (tetragonal FeS) rather than as a discrete As2S3 phase. This study shows that mackinawite formation in contaminated floodplain soil can help mitigate the extent of arsenic mobilization during prolonged flooding.
Sorption of Arsenic(V) and Arsenic(III) to Schwertmannite
Publisher: American Chemical Society (ACS)
Date: 18-11-2009
DOI: 10.1021/ES902461X
Abstract: This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH approximately 8.0 at loadings 4.6). Sorption of As(V) and As(III) caused significant release of SO(4)(2-) from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acid-mine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmannite-rich systems.
Sulfur, iron and carbon cycling following hydrological restoration of acidic freshwater wetlands
Publisher: Elsevier BV
Date: 04-2014
Spatial and temporal changes in estuarine water quality during a post-flood hypoxic event
Publisher: Elsevier BV
Date: 03-2010
Synchrotron X-ray absorption spectroscopy reveals antimony sequestration by reduced sulfur in a freshwater wetland sediment
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/EN16198
Abstract: Environmental contextAntimony is an environmental contaminant of increasing concern, due to its growing industrial usage in flame retardants, lead alloys, glass, ceramics and plastics. Here we show, using X-ray absorption spectroscopy, that antimony may be trapped in wetland sediments by reduced sulfur. This finding has implications for the management and remediation of wetlands contaminated with antimony. AbstractThe biogeochemistry of antimony (Sb) in wetland sediments is poorly characterised, despite their importance as contaminant sinks. The organic-rich, reducing nature of wetland sediments may facilitate sequestration mechanisms that are not typically present in oxic soils, where the majority of research to date has taken place. Using X-ray absorption spectroscopy (XAS), we present evidence of antimony speciation being dominated by secondary antimony–sulfur phases in a wetland sediment. Our results demonstrate that, by incorporating a newly developed SbIII–organic sulfur reference standard, linear combination fitting analysis of antimony K-edge XAS spectra and robust statistical assessment of fit quality allows the reliable discrimination of SbIII coordination environments. We found that a contaminated wetland sediment in New South Wales, Australia, contained 57% of the total antimony as SbIII–phases, with 44% present as a highly-disordered antimony phase, likely consisting of SbIII complexed by organic sulfur (e.g. thiols) or an amorphous SbIII sulfide (e.g. SbS3). The methodological approach outlined in this study and our identification of the importance of reduced sulfur in sequestering antimony has implications for future research in the area of antimony biogeochemistry, and for the management of both natural and artificial wetlands contaminated with antimony.
Arsenic sorption to nanoparticulate mackinawite (FeS): An examination of phosphate competition
Publisher: Elsevier BV
Date: 11-2016
DOI: 10.1016/J.ENVPOL.2016.08.031
Abstract: Nanoparticulate mackinawite (FeS) can be an important host-phase for arsenic (As) in sulfidic, subsurface environments. Although not previously investigated, phosphate (PO
Iron and sulfur cycling in acid sulfate soil wetlands under dynamic redox conditions: A review
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.CHEMOSPHERE.2018.01.096
Abstract: Acid sulfate soils (ASS) contain substantial quantities of iron sulfide minerals or the oxidation reaction products of these sulfidic minerals. Transformation of iron (Fe) and sulfur (S) bearing minerals is an important process in ASS wetlands with fluctuating redox conditions. A range of potentially toxic metals and metalloids can either be adsorbed on or incorporated into the structure of Fe and S bearing minerals. Therefore, transformation of these minerals as affected by dynamic redox conditions may regulate the mobility and bioavailability of associated metals/metalloids. Better understanding of the interaction between Fe/S biogeochemistry and trace metal/metalloid mobility under fluctuating redox conditions is important for assessing contaminant risk to the environment. This review paper provides an overview of current knowledge regarding cycling of Fe, S and selected trace metal/metalloids in ASS wetlands under fluctuating redox conditions and outlines future research challenges and directions on this subject.
A simple and inexpensive chromium-reducible sulfur method for acid-sulfate soils
Publisher: Elsevier BV
Date: 09-2008
Fe and S K-edge XAS determination of iron-sulfur species present in a range of acid sulfate soils: Effects of particle size and concentration on quantitative XANES determinations
Publisher: IOP Publishing
Date: 11-2009
Tooeleite Transformation and Coupled As(III) Mobilization Are Induced by Fe(II) under Anoxic, Circumneutral Conditions
Publisher: American Chemical Society (ACS)
Date: 23-06-2022
Jarosite quantification in soils: An enhanced sequential extraction procedure
Publisher: Elsevier BV
Date: 12-2014
Iron monosulfide enrichment and the presence of organosulfur in eutrophic estuarine sediments
Publisher: Elsevier BV
Date: 02-2012
Iron(III) accumulations in inland saline waterways, Hunter Valley, Australia: Mineralogy, micromorphology and pore-water geochemistry
Publisher: Elsevier BV
Date: 10-2009
Arsenic removal by perilla leaf biochar in aqueous solutions and groundwater: An integrated spectroscopic and microscopic examination
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.ENVPOL.2017.09.051
Abstract: In this study, we examined the removal of arsenite (As(III)) and arsenate (As(V)) by perilla leaf-derived biochars produced at 300 and 700 °C (referred as BC300 and BC700) in aqueous environments. Results revealed that the Langmuir isotherm model provided the best fit for As(III) and As(V) sorption, with the sorption affinity following the order: BC700-As(III) > BC700-As(V) > BC300-As(III) > BC300-As(V) (Q
Acidic drainage drives anomalous rare earth element signatures in intertidal mangrove sediments
Publisher: Elsevier BV
Date: 12-2016
DOI: 10.1016/J.SCITOTENV.2016.08.172
Abstract: Sedimentary rare earth element (REE) signatures can provide powerful insights into nearshore biogeochemical processes and anthropogenic influences. Despite this, there is limited research investigating REE behaviour in sediments influenced by coastal acid sulfate soils (CASS). Here, we explore REE abundance and fractionation in intertidal mangrove sediments that received CASS drainage for ~15-20y within the Hastings Catchment in NSW, Australia. Sediments close to the CASS discharge point ( 1.5), with a high proportion (63-100%) of REEs residing in the reactive (1M HCl extractable) sediment fraction. Interestingly, the degree of MREE enrichment was significantly correlated with Ce anomalies (r
Effects of hyper-enriched reactive Fe on sulfidisation in a tidally inundated acid sulfate soil wetland
Publisher: Springer Science and Business Media LLC
Date: 14-05-2010
Remediation of Pb-contaminated soil using modified bauxite refinery residue
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.JHAZMAT.2022.129339
Abstract: This study examines amendment of Pb-contaminated soil with modified bauxite refinery residue (MBRR) to decrease soil Pb mobility and bioaccessibility. Amendment experiments were conducted using four soils contaminated with Pb from various sources, including smelting, shooting-range activities and Pb-based paint waste. Lead L
Vanadium Speciation in Ancient Shales Revealed through Synchrotron-Based X-ray Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 26-09-0002
Arsenic-Imposed Effects on Schwertmannite and Jarosite Formation in Acid Mine Drainage and Coupled Impacts on Arsenic Mobility
Publisher: American Chemical Society (ACS)
Date: 19-05-2021
Sedimentary iron geochemistry in acidic waterways associated with coastal lowland acid sulfate soils
Publisher: Elsevier BV
Date: 11-2006
In-situ partitioning of butyltin compounds in estuarine sediments
Publisher: Elsevier BV
Date: 04-2005
DOI: 10.1016/J.CHEMOSPHERE.2004.10.067
Abstract: The in-situ solid ore-water partitioning of tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT) was determined for an estuarine sediment profile collected from a commercial marina. Total butyltin levels exceeded sediment quality guideline values, and were 220-8750 microg/kg for TBT, 150-5450 microg/kg for DBT and 130-4250 microg/kg for MBT. Pore-water butyltin concentrations ranged from 0.05 to 2.35 microg/l for TBT, 0.07-3.25 microg/l for DBT, and 0.05-0.53 microg/l for MBT. The partitioning of butyltin compounds between the sediment solid-phase and pore-water was described by an organic carbon normalised distribution ratio (D(OC)). The observed D(OC) values were similar for TBT, DBT and MBT, and were 10(5)-10(6) l/kg. Values for the Butyltin Degradation Index (BDI) were larger than 1 at depths greater than 10 cm below the sediment/water-column interface. This indicates that substantial TBT degradation has occurred in the sediments, and suggests that natural attenuation may be a viable sediment remediation strategy.
Electrochemical Analysis of Highly Reactive Pyrite
Publisher: The Electrochemical Society
Date: 16-04-2010
DOI: 10.1149/1.3367908
Abstract: S les of highly reactive pyritic material, exposed during the construction of the Pennsylvania Interstate Highway 99 (I-99) has been characterized by X-ray diffraction, Raman microprobe spectroscopy, electron microscopy and electrochemical methods. Mineral standards of marcasite, arsenopyrite and pyrite were compared in order to determine the cause of rapid generation of acid and liberation of dissolved metals observed in the exposed pyritic material. Linear sweep voltammetry found no significant differences in the electrochemical activity, however, a significantly lower open circuit potential was found in the reactive pyrite material than in the pyrite or marcasite standards. A high concentration of zinc and aluminium impurities was observed in Energy Dispersive X-ray analysis of the finest iron sulfide crystals found in the reactive pyritic material.
Diffusive Gradients in Thin Films Reveals Differences in Antimony and Arsenic Mobility in a Contaminated Wetland Sediment during an Oxic-Anoxic Transition
Publisher: American Chemical Society (ACS)
Date: 26-01-2018
Abstract: Antimony (Sb) and arsenic (As) are priority environmental contaminants that often co-occur at mining-impacted sites. Despite their chemical similarities, Sb mobility in waterlogged sediments is poorly understood in comparison to As, particularly across the sediment-water interface (SWI) where changes can occur at the millimeter scale. Combined diffusive gradients in thin films (DGT) and diffusive equilibration in thin films (DET) techniques provided a high resolution, in situ comparison between Sb, As, and iron (Fe) speciation and mobility across the SWI in contaminated freshwater wetland sediment mesocosms under an oxic-anoxic-oxic transition. The shift to anoxic conditions released Fe(II), As(III), and As(V) from the sediment to the water column, consistent with As release being coupled to the reductive dissolution of iron(III) (hydr)oxides. Conversely, Sb(III) and Sb(V) effluxed to the water column under oxic conditions and fluxed into the sediment under anoxic conditions. Porewater DGT-DET depth profiles showed apparent decoupling between Fe(II) and Sb release, as Sb was primarily mobilized across the SWI under oxic conditions. Solid-phase X-ray absorption spectroscopy (XAS) revealed the presence of an Sb(III)-S phase in the sediment that increased in proportion with depth and the transition from oxic to anoxic conditions. The results of this study showed that Sb mobilization was decoupled from the Fe cycle and was, therefore, more likely linked to sulfur and/or organic carbon (e.g., most likely authigenic antimony sulfide formation or Sb(III) complexation by reduced organic sulfur functional groups).
Iron behavior in a northern estuary: Large pools of non-sulfidized Fe(II) associated with organic matter
Publisher: Elsevier BV
Date: 10-2015
Copper behaviour in a Podosol. 1. pH-dependent sorption-desorption, sorption isotherm analysis, and aqueous speciation modelling
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/SR04117
Abstract: The effects of pH and Cu loading on the solid/solution partitioning of Cu in a Podosol from south-east Queensland, Australia was examined. Sorption–desorption of Cu exhibited maximum linear distribution coefficients (KD) at approximately pH 5. Observed decrease in KD values at pH was attributed to increased solubility of native dissolved organic carbon (DOC) at higher pH and subsequent formation of non-sorbing Cu–DOC complexes. Speciation modelling with the MINTEQA2 code indicated that % of aqueous Cu was present as Cu–DOC complexes at pH .5. The effect of Cu loading was examined with sorption isotherm analysis at pH 5 using solid : solution ratio approaches that were both constant (1 : 2 and 1 : 10) and variable. As the solid : solution ratio increased, the proportion of Cu sorbed decreased due to the formation of Cu-DOC complexes. However, this effect was negligible once these Cu–DOC complexes were accounted for via free Cu2+ sorption isotherms. This indicated that Cu2+ sorption at concentrations .08 mg/L was described by a KD value of approximately 3000 L/kg. Despite this relatively high KD value for Cu2+ sorption, the results indicate that Cu–DOC complexes significantly enhance Cu solubility in soils high in DOC.
A revised method for determining existing acidity in re-flooded acid sulfate soils
Publisher: Elsevier BV
Date: 2015
Copper behaviour in a Podosol. 2. Sorption reversibility, geochemical partitioning, and column leaching
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/SR04118
Abstract: The sorption–desorption and leaching behaviour of Cu in a Podosol from south-east Queensland, Australia, was examined. Copper sorption was described by a linear distribution coefficient at low sorption levels (KDCa→0) of 481 L/kg and a sorption capacity (CS,Max) of 382 mg/kg. Selective removal of soil organic matter reduced these values by approximately 95%, indicating that Cu was sorbed predominantly to soil organic matter. The KDCa→0 and CS,Max values from Cu desorption experiments were 934 L/kg and 516 mg/kg, respectively, which indicates that sorption was not fully reversible. This irreversibility was related to aqueous Cu speciation (modelled with MINTEQA2), showing that aqueous complexes between Cu and dissolved organic carbon (DOC) comprised 28.3–72.8% and 21.3–45.4% of aqueous Cu in the sorption and desorption experiment, respectively. Sorption irreversibility was not evident when the corresponding data was presented as free Cu2+ isotherms. Both sorption and desorption experiments with free Cu2+ .2 mg/L were described by a KDCa→0 value of approximately 3000 L/kg. Sequential extraction of sorbed Cu indicated that at low concentrations, sorption occurred primarily via specific interactions, with non-specific sorption becoming increasing important at higher concentrations. Desorption of Cu in a column leaching experiment was attributable to exchange of sorbed Cu2+ with Na+. Leaching with a DOC solution of pH 7 and 135 mg/L greatly enhanced Cu mobility due to the formation of aqueous Cu–DOC complexes.
Schwertmannite in soil materials: Limits of detection of acidified ammonium oxalate method and differential X-ray diffraction
Publisher: Elsevier BV
Date: 07-2015
Iron-Monosulfide Oxidation in Natural Sediments: Resolving Microbially Mediated S Transformations Using XANES, Electron Microscopy, and Selective Extractions
Publisher: American Chemical Society (ACS)
Date: 04-2009
DOI: 10.1021/ES8036548
Abstract: Iron-monosulfide oxidation and associated S transformations in a natural sediment were examined by combining selective extractions, electron microscopy and S K-edge X-ray absorption near-edge structure (XANES) spectroscopy, The sediment examined in this study was collected from a waterway receiving acid-sulfate soil drainage. It contained a high acid-volatile sulfide content (1031 micromol g(-1)), reflecting an abundance of iron-monosulfide. The iron-monosulfide speciation in the initial sediment s le was dominated by nanocrystalline mackinawite (tetragonal FeS). At near-neutral pH and an 02 partial pressure of approximately 0.2 atm, the mackinawite was found to oxidize rapidly, with a half-time of 29 +/- 2 min. This oxidation rate did not differ significantly (P < 0.05) between abiotic versus biotic conditions, demonstrating that oxidation of nanocrystalline mackinawite was not microbially mediated. The extraction results suggested that elemental S (S8(0)) was a key intermediate S oxidation product Transmission electron microscopy showed the S8(0) to be amorphous nanoglobules, 100-200 nm in diameter. The quantitative importance of S8(0) was confirmed by linear combination XANES spectroscopy, after accounting for the inherent effect of the nanoscale S8(0) particle-size on the corresponding XANES spectrum. Both the selective extraction and XANES data showed that oxidation of S8(0) to SO4(2-) was mediated by microbial activity. In addition to directly revealing important S transformations, the XANES results support the accuracy of the selective extraction scheme employed here.
Synchrotron X-ray spectroscopy for investigating vanadium speciation in marine sediment: limitations and opportunities
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8JA00231B
Abstract: Synchrotron-based X-ray spectroscopy is a powerful technique for investigating vanadium speciation in marine sediment.
Rapid arsenic(V)-reduction by fire in schwertmannite-rich soil enhances arsenic mobilisation
Publisher: Elsevier BV
Date: 04-2018
Tributyltin partitioning in sediments: Effect of aging
Publisher: Elsevier BV
Date: 03-2006
DOI: 10.1016/J.CHEMOSPHERE.2005.07.048
Abstract: The effect of aging on the solid ore-water partitioning and desorption behaviour of tributyltin (TBT) in sediments was examined. Three sediment s les with contrasting physical and chemical properties were spiked with 10 mg/kg TBT and aged under sterile conditions for periods of time ranging from 1 to 84 days. Aging had a negligible effect on partitioning and desorption behaviour in a sandy s le with very low organic carbon content (0.2% w/w). In contrast, for s les with larger amounts of organic carbon (2.6% and 4.8% w/w), aging caused substantial increases in TBT sorption. For these s les, apparent distribution coefficients (KD,app) obtained from sequential 2 h desorption experiments also exhibited a twofold increase between spiked sediments subjected to aging for 1 day and 84 days. This study demonstrates that aging effects may be an important aspect of TBT fate in contaminated sediments.
Coupling of arsenic mobility to sulfur transformations during microbial sulfate reduction in the presence and absence of humic acid
Publisher: Elsevier BV
Date: 04-2013
Fractionation and extractability of sulfur, iron and trace elements in sulfidic sediments
Publisher: Elsevier BV
Date: 08-2006
DOI: 10.1016/J.CHEMOSPHERE.2005.12.003
Abstract: This study describes iron and sulfur fractionation, and the related extractability of selected trace elements (As, Cd, Cr, Cu, Ni, Pb and Zn) in estuarine sediments. The sediments were sulfidic, with moderately high concentrations of pore-water sulfide (200-600 micromol l(-1)) and acid-volatile sulfide (AVS 9.9-129 micromol g(-1)). Pyrite-S concentrations increased with depth, with 63-251 micromol g(-1) at site W1 and 312-669 micromol g(-1) at site W2. The degree of sulfidisation was generally high (>80%), indicating that Fe may be limiting pyrite accumulation. The ratios of AVS to pyrite-S increased with sediment depth, as expected for the pyritisation of solid-phase AVS. Cadmium, Pb and Zn extractability in 1M HCl indicated that these elements are not significantly sequestered during pyritisation, whereas sequestration may be important for As, Cu and possibly Ni. Extractability trends for Cr suggest that diagenesis in sulfidic sediments may enhance Cr reactivity. Overall, replacement of AVS by pyrite during diagenesis may enhance the reactivity of Cd, Cr, Pb and Zn, whereas As, Cu and possibly Ni may be rendered less reactive.
Chromium(VI) formation via heating of Cr(III)-Fe(III)-(oxy)hydroxides: A pathway for fire-induced soil pollution
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.CHEMOSPHERE.2019.01.172
Abstract: Mixed Cr(III)-Fe(III) (oxy)hydroxides are important Cr-bearing phases in natural, unpolluted soil. Fires frequently affect large areas of land around the world, causing the temporary development of elevated soil temperatures. This study examines the hypothesis that heating Cr(III)-Fe(III) (oxy)hydroxides at temperatures which occur in surface soils during fires can drive rapid oxidation of Cr(III) to hazardous Cr(VI). To test this, poorly-ordered Cr(III)
Acidity generation accompanying iron and sulfur transformations during drought simulation of freshwater re-flooded acid sulfate soils
Publisher: Elsevier BV
Date: 2017
Enrichment and heterogeneity of trace elements at the redox-interface of Fe-rich intertidal sediments
Publisher: Elsevier BV
Date: 09-2014
Mechanisms of Arsenic and Antimony Co-sorption onto Jarosite: An X-ray Absorption Spectroscopic Study
Publisher: American Chemical Society (ACS)
Date: 17-03-2023
Seawater inundation of coastal floodplain sediments: Short-term changes in surface water and sediment geochemistry
Publisher: Elsevier BV
Date: 03-2015
Trace metals and nutrients in bottom sediments of the Southport Broadwater, Australia
Publisher: Elsevier BV
Date: 02-2004
Effect of sample pretreatment on the fractionation of Fe, Cr, Ni, Cu, Mn, and Zn in acid sulfate soil materials
Publisher: Elsevier BV
Date: 10-2010
Effect of diffusion and resuspension on nutrient release from submerged sediments
Publisher: Informa UK Limited
Date: 07-2005
Reductive transformation of birnessite and the mobility of co-associated antimony
Publisher: Elsevier BV
Date: 02-2020
Contemporary pedogenesis of severely degraded tropical acid sulfate soils after introduction of regular tidal inundation
Publisher: Elsevier BV
Date: 03-2009
Coupling of Dissolved Organic Matter Molecular Fractionation with Iron and Sulfur Transformations during Sulfidation–Reoxidation Cycling
Publisher: American Chemical Society (ACS)
Date: 20-10-2023
Antimonate Controls Manganese(II)-Induced Transformation of Birnessite at a Circumneutral pH
Publisher: American Chemical Society (ACS)
Date: 06-07-2021
Effects of pH and salinity on copper, lead, and zinc sorption rates in sediments from Moreton Bay, Australia
Publisher: Springer Science and Business Media LLC
Date: 12-2004
Antimony mobility in sulfidic systems: Coupling with sulfide-induced iron oxide transformations
Publisher: Elsevier BV
Date: 08-2020
Decoupling between Water Column Oxygenation and Benthic Phosphate Dynamics in a Shallow Eutrophic Estuary
Publisher: American Chemical Society (ACS)
Date: 18-03-2013
DOI: 10.1021/ES304868T
Abstract: Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.
Sorption and Desorption Behavior of Tributyltin with Natural Sediments
Publisher: American Chemical Society (ACS)
Date: 12-11-2004
DOI: 10.1021/ES049291S
Abstract: Tributyltin (TBT) sorption to four natural sediment s les in artificial seawater was examined under a range of modified pH and salinity conditions. Three of the sediment s les were relatively pristine with regard to TBT contamination, but the fourth was a TBT-contaminated sediment from a commercial marina. Sorption of TBT was described well by linear sorption isotherms, with distribution coefficients ranging from 6.1 to 5210 L/kg depending on the pH and salinity. The sediment organic C content and particle size distribution were important determinants of sorption behavior. The presence of resident TBT in the contaminated marina sediment caused a substantial reduction in further TBT sorption. Desorption of TBT from the marina sediment was described by relatively large observed distribution coefficients ranging from 5100 to 9400 L/kg, suggesting that aging effects may reduce sorption reversibility. Increased artificial seawater salinity generally reduced TBT sorption at pH 4 and 6, but enhanced TBT sorption at pH 8. Regardless of salinity, maximum sorption of TBT was observed at pH 6, which is attributed to an optimal balance between the abundance of cationic TBT+ species and deprotonated surface ligands. Consideration of aqueous TBT speciation along with octanol-water partitioning behavior suggests that hydrophobic partitioning of TBTCl(0) to nonpolar organic matter was important for pH < 6, while partitioning of TBTOH(0) was important at higher pH.
An X-ray absorption spectroscopic study of the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.JHAZMAT.2022.128580
Abstract: The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, Cr
Stability of schwertmannite and jarosite in an acidic landscape: Prolonged field incubation
Publisher: Elsevier BV
Date: 02-2015
Legacy impacts of acid sulfate soil runoff on mangrove sediments: Reactive iron accumulation, altered sulfur cycling and trace metal enrichment
Publisher: Elsevier BV
Date: 06-2012
Quantifying alkalinity generating processes in a tidally remediating acidic wetland
Publisher: Elsevier BV
Date: 04-2012
Phosphate loading alters schwertmannite transformation rates and pathways during microbial reduction
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.SCITOTENV.2018.12.082
Abstract: Acid sulfate systems commonly contain the metastable ferric oxyhydroxysulfate mineral schwertmannite, as well as phosphate (PO
Changes in water quality following tidal inundation of coastal lowland acid sulfate soil landscapes
Publisher: Elsevier BV
Date: 2009
Seawater-induced mobilization of trace metals from mackinawite-rich estuarine sediments
Publisher: Elsevier BV
Date: 02-2013
DOI: 10.1016/J.WATRES.2012.11.009
Abstract: Benthic sediments in coastal acid sulfate soil (CASS) drains can contain high concentrations (~1-5%) of acid volatile sulfide (AVS) as nano-particulate mackinawite. These sediments can sequester substantial quantities of trace metals. Because of their low elevation and the connectivity of drains to estuarine channels, these benthic sediments are vulnerable to rapid increases in ionic strength from seawater incursion by floodgate opening, floodgate failure, storm surge and seasonal migration of the estuarine salt wedge. This study examines the effect of increasing seawater concentration on trace metal mobilization from mackinawite-rich drain sediments (210-550 μmol g⁻¹ AVS) collected along an estuarine salinity gradient. Linear combination fitting of S K-edge XANES indicated mackinawite comprised 88-96% of sediment-bound S. Anoxic sediment suspensions were conducted with seawater concentrations ranging from 0% to 100%. We found that mobilization of some metals increased markedly with increasing ionic strength (Cu, Fe, Mn, Ni) whereas Al mobilization decreased. The largest proportion of metals mobilized from the labile metal pool, operationally defined as Σexchangeable + acid-extractable + organically-bound metals, occurred in sediments from relatively fresh upstream sites (up to 39% mobilized) compared to sediments sourced from brackish downstream sites (0-11% mobilized). The extent of relative trace metal desorption generally followed the sequence Mn > Ni ≈ Cu > Zn > Fe > Al. Trace metal mobilization from these mackinawite-rich sediments was attributed primarily to desorption of weakly-bound metals via competitive exchange with marine-derived cations and enhanced complexation with Cl⁻ and dissolved organic ligands. These results have important implications for trace metal mobilization from these sediments at near-neutral pH under current predicted sea-level rise and climate change scenarios.
Antimony and Arsenic Behavior during Fe(II)-Induced Transformation of Jarosite
Publisher: American Chemical Society (ACS)
Date: 05-04-2017
Abstract: Jarosite can be an important scavenger for arsenic (As) and antimony (Sb) in acid mine drainage (AMD) and acid sulfate soil (ASS) environments. When subjected to reducing conditions, jarosite may undergo reductive dissolution, thereby releasing As, Sb, and Fe
Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species
Publisher: American Chemical Society (ACS)
Date: 28-11-2022
Abstract: Examination of stable Fe isotopes is a powerful tool to explore Fe cycling in a range of environments. However, the isotopic fractionation of Fe in acid mine drainage (AMD) has received little attention and is poorly understood. Here, we analyze Fe isotopes in waters and Fe(III)-rich solids along an AMD flow-path. Aqueous Fe spanned a concentration and δ
Arsenic Mobilization Is Enhanced by Thermal Transformation of Schwertmannite
Publisher: American Chemical Society (ACS)
Date: 22-07-2016
Abstract: Fires in iron-rich seasonal wetlands can thermally transform Fe(III) minerals and alter their crystallinity. However, the fate of As associated with thermally transformed Fe(III) minerals is unclear, as are the consequences for As mobilization during subsequent reflooding and reductive cycles. Here, we subject As(V)-coprecipitated schwertmannite to thermal transformation (200, 400, 600 and 800 °C) followed by biotic reductive incubation (150 d) and examine aqueous- and solid-phase speciation of As, Fe and S. Heating to >400 °C caused transformation of schwertmannite to a nanocrystalline hematite with greater surface area and smaller particle size. Higher temperatures also caused the initially structurally incorporated As to become progressively more exchangeable, increasing surface-complexed As (AsEx) by up to 60-fold, thereby triggering enhanced As mobilization during incubation (∼70-fold in the 800 °C treatment). Although more As was mobilized in biotic treatments than controls (∼3-20×), in both cases it was directly proportional to initial AsEx and mainly due to abiotic desorption. Higher transformation temperatures also drove ergent pathways of Fe and S biomineralization and led to more As(V) and SO4 reduction relative to Fe(III) reduction. This study reveals thermal transformation of schwertmannite can greatly increase As mobility and has major consequences for As/Fe/S speciation under reducing conditions. Further research is warranted to unravel the wider implications for water quality in natural wetlands.
Schwertmannite transformation to goethite via the Fe(II) pathway: Reaction rates and implications for iron–sulfide formation
Publisher: Elsevier BV
Date: 09-2008
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