ORCID Profile
0000-0003-1584-9341
Current Organisations
Griffith University
,
University of South Australia
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Publisher: Elsevier BV
Date: 09-2021
Publisher: American Chemical Society (ACS)
Date: 08-11-2017
Abstract: Aquatic ammonia has toxic effects on aquatic life. This work reports a gas-permeable membrane-based conductivity probe (GPMCP) developed for real-time monitoring of ammonia in aquatic environments. The GPMCP innovatively combines a gas-permeable membrane with a boric acid receiving phase to selectively extract ammonia from s les and form ammonium at the inner membrane interface. The rate of the receiving phase conductivity increase is directly proportional to the instantaneous ammonia concentration in the s le, which can be rapidly and sensitively determined by the embedded conductivity detector. A precalibration strategy was developed to eliminate the need for an ongoing calibration. The analytical principle and GPMCP performance were systematically validated. The laboratory results showed that ammonia concentrations ranging from 2 to 50 000 μg L
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 2016
DOI: 10.1016/J.ACA.2015.11.022
Abstract: A new diffusive gradients in a thin film (DGT) technique, using Microlite PrCH cation exchange resin, was developed and evaluated for measuring NH4-N in freshwaters. Microlite PrCH had high uptake (>92.5%) and elution efficiencies (87.2% using 2 mol L(-1) NaCl). Mass vs. time validation experiments over 24 h demonstrated excellent linearity (R(2) ≥ 0.996). PrCH-DGT binding layers had an extremely high intrinsic binding capacity for NH4-N (∼3000 μg). NH4-N uptake was quantitative over pH ranges 3.5-8.5 and ionic strength (up to 0.012 mol L(-1) as NaCl) typical of freshwater systems. Several cations (Na(+), K(+), Ca(2+) and Mg(2+)) were found to compete with NH4-N for uptake by PrCH-DGT, but NH4-N uptake was quantitative over concentration ranges typical of freshwater (up to 0.012 mol L(-1) Na(+), 0.006 mol L(-1) K(+), 0.003 mol L(-1) Ca(2+) and 0.004 mol L(-1) Mg(2+)). Effective diffusion coefficients determined from mass vs. time experiments changed non-linearly with electrical conductivity. Field deployments of DGT s lers with varying diffusive layer thicknesses validated the use of the technique in situ, allowed deployment times to be manipulated with respect to NH4-N concentration, and enable the calculation of the diffusive boundary layer thickness. Daily grab s le NH4-N concentrations were observed to vary considerably independent of major rainfall events, but good agreements were obtained between PrCH-DGT values and mean grab s le measurements of NH4-N (CDGT:CSOLN 0.83-1.3). Reproducibility of DGT measurements in the field was good (relative standard deviation < 11%). Limit of detection was 0.63 μg L(-1) (equivalent to 0.045 μmol L(-1)) based on 24 h deployments.
Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.ACA.2017.08.024
Abstract: A modified diffusive gradients in thin films (DGT) technique uses both a mixed binding layer (PrCH and A520E resins for NH
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 10-2013
DOI: 10.1016/J.JINORGBIO.2013.07.034
Abstract: The intercalative interactions of small molecules with DNA are important in a variety of biological processes including mutagenesis, carcinogenesis, and chemotherapy. A comprehensive research protocol including experiments and calculations was employed to investigate the intercalative interaction between metallointercalator copper(II) complex and DNA. The intercalative binding mode has been validated by UV spectra, fluorescence spectra, CD spectra and viscosity measurements. The classical molecular dynamics simulation was carried out to investigate the intercalative interaction between asymmetric copper(II) complex and DNA. An analytical method was proposed to simulate the dynamically changing absorption spectra of intercalator/DNA system. According to the established model, the changing process of the electronic absorption spectra for intercalator/DNA system can be predicted accurately. A rational explanation for the change law of absorption spectra has been proposed. Moreover, the analyses of the frontier orbital reveal that the red shift of the absorption spectra is due to the increase of π orbital energy caused by the coupling of the π orbital of the intercalated ligand with the π orbital of DNA. This cause of red shift of spectra is completely different from the previous inference. All these insights are of crucial importance for correctly analyzing the absorption spectra of intercalative interaction, as well as for explaining the macroscopic phenomena observed in experiments at the molecular level.
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.CHEMOSPHERE.2019.125388
Abstract: Measurement of sulfide in pore waters is critical for understanding biogeochemical processes, especially within coastal sediments. Here we report the development of a new colorimetric DET (diffusive equilibration in thin films) technique for determining mm-resolution, two-dimensional sulfide distributions in sediment pore waters. This colorimetric sulfide DET method was based on the standard spectrophotometric methylene blue assay, but modified to allow quantitation of sulfide by computer imaging densitometry. The method detection and effective upper measurement limits of the optimised technique were 3.7 and 1000 μmol L
Publisher: Elsevier BV
Date: 08-2019
DOI: 10.1016/J.TALANTA.2019.03.043
Abstract: Monitoring low levels of ammonia in chloraminated water can be challenging but is important for effectively managing potable water disinfection. The lower the concentration of free ammonia that can be determined, the tighter the control at the disinfection point, which supports better maintenance of chloramine residuals in the distribution system. In this study a micro-distillation technique was used to selectively separate ammonia into a boric acid solution allowing determination by conductance (i.e., micro-distillation and conductance measurement instrument - Micro-DCMI). The optimised technique had a linear calibration range of 0.01-60 mg NH
Publisher: Elsevier BV
Date: 06-2016
DOI: 10.1016/J.ACA.2016.04.006
Abstract: A new diffusive gradients in thin films (DGT) technique, using Purolite A520E anion exchange resin, was developed and evaluated for the measurement of NO3N in freshwaters. Purolite A520E had a very high uptake efficiency (>98%) and elution efficiency (82.7% with 2 mol L(-1) NaCl as eluent) for NO3N. The 24 h mass vs. time validation experiments had excellent linearity (R(2) ≥ 0.997) and the intrinsic capacity of the binding layer for NO3N was 849 ± 24 μg. NO3N uptake was quantitative over a pH (3.5-8.5) range typical of most natural freshwaters. Several anions competed with NO3N to produce a lower effective binding capacity for NO3N in the following order of selectivity, Cl(-) > HCO3(-) > SO4(2-) > H2PO4(-), although NO3N measurements were quantitative at ionic strengths 0.0001-0.008 mol L(-1) as NaCl. NO2N did not adversely affect determination of NO3N at typical concentrations. Field deployments of DGT s lers with varying diffusive layer thicknesses validated the use of the technique in situ, allowed calculation of the diffusive boundary layer and accurate measurement of NO3N (CDGT/CSOLN 1.03-1.04). Reproducibility of the technique during field deployments was good (relative standard deviation < 3.2%). Limits of detection of A520E-DGT for NO3N were 13.15 μg L(-1) and 7.52 μg L(-1) (equivalent to 0.94 and 0.54 μmol L(-1)) based on 24 h and 48 h deployments, respectively. A520E-DGT determined NO3N concentrations during field deployments were very similar to the average values obtained from 0.45 μm filtered grab s les, which confirmed that the new DGT technique produced highly representative results.
Publisher: Elsevier BV
Date: 05-2020
Publisher: American Chemical Society (ACS)
Date: 02-12-2016
Abstract: Nutrient concentrations in freshwater are highly variable over time, with changes driven by weather events, anthropogenic sources, modifications to catchment hydrology or habitats, and internal biogeochemical processes. Measuring infrequently collected grab s les is unlikely to adequately represent nutrient concentrations in such dynamic systems. In contrast, in situ passive s ling techniques, such as the "diffusive gradients in thin films" (DGT) technique, provide time-weighted average analyte concentrations over the entire deployment time. A pair of recently developed DGT techniques for nitrate (A520E-DGT) and ammonium (PrCH-DGT), as well as the Metsorb-DGT technique for phosphate, were used to monitor inorganic nutrients in different freshwater systems (i.e., streams and wetlands) with a range of environmental values and that were affected by different catchment types. Measurements of grab s les collected frequently (1-2 times daily, 8-10 a.m. and 2-4 p.m.) showed that concentrations of NH
Publisher: Wiley
Date: 2022
DOI: 10.1002/AEL2.20068
Abstract: The diffusive gradients in thin‐films (DGT) technique shows in many publications a superior correlation to the amount of plant‐available phosphorus (P) in soil. However, this technique cannot give information on the plant‐available P species in soil. Therefore, we combined DGT with solution 31 P nuclear magnetic resonance (NMR) spectroscopy. This was achieved by using a modified DGT device in which the diffusive layer had a larger pore size, the binding layer incorporated an adsorption material with a higher capacity, and the device had a larger exposure area. The spectroscopic investigation was undertaken after elution of the deployed DGT binding layer in a NaOH solution. Adsorption tests using solutions of known organic P compounds showed that a sufficient amount of these compounds could be adsorbed on the binding layer in order for them to be analyzed by solution 31 P NMR spectroscopy. Furthermore, various intermediates of the hydrolysis of trimetaphosphate in soil could be also analyzed over time. Core Ideas We show a promising combination of DGT technique and solution 31 P NMR spectroscopy. This technique combination can identify organic phosphorus species in solutions. Modified DGT device can analyze the hydrolysis of trimetaphosphate in soil.
Publisher: Springer Science and Business Media LLC
Date: 31-10-2021
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.CHEMOSPHERE.2017.08.144
Abstract: In productive coastal sediments the separation between different biogeochemical zones (e.g. oxic, iron(III)-reducing and sulfate-reducing) may be on the scale of millimetres. Conventional measurement techniques simply cannot resolve changes in pore water solute concentrations over such small distances. The diffusive equilibration in thin films (DET) and the diffusive gradients in thin films (DGT) techniques allow in situ determination of pore water solute concentration profiles with one-dimensional profiles and/or two-dimensional distributions on the millimetre scale. Here we compare measurements of pore water iron(II) and sulfide using conventional core s ling (slicing and centrifugation) and colorimetric DET-DGT techniques. DET-DGT s lers were deployed within replicate sediment cores from three different sites, which were processed by slicing and centrifugation following retrieval of the s lers, so that the measurements were approximately co-located. Iron(II) concentrations were determined by DET at all three sites (0.3-262 μmol L
Publisher: American Chemical Society (ACS)
Date: 11-05-2021
Publisher: Elsevier
Date: 2019
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.JENVMAN.2022.116625
Abstract: High organic loadings to constructed wetlands can result in water quality issues such as low dissolved oxygen and high ammonium concentrations, with artificial aeration a potential mitigation option. This study compared baseline (no aeration - NA), continuous aeration (CA), and intermittent aeration (IA) conditions to improve water quality in a tertiary treatment free water surface constructed wetland (FWS CW) with night time hypoxia/anoxia, and high nutrient concentrations. The response variables included dissolved oxygen (DO), total nitrogen (TN), ammonium nitrogen (NH
Publisher: Elsevier BV
Date: 05-2019
Publisher: Wiley
Date: 25-12-2020
DOI: 10.1002/LNO.11681
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.JES.2017.09.009
Abstract: Ammonium is an important nutrient in primary production however, high ammonium loads can cause eutrophication of natural waterways, contributing to undesirable changes in water quality and ecosystem structure. While ammonium pollution comes from diffuse agricultural sources, making control difficult, industrial or municipal point sources such as wastewater treatment plants also contribute significantly to overall ammonium pollution. These latter sources can be targeted more readily to control ammonium release into water systems. To assist policy makers and researchers in understanding the ersity of treatment options and the best option for their circumstance, this paper produces a comprehensive review of existing treatment options for ammonium removal with a particular focus on those technologies which offer the highest rates of removal and cost-effectiveness. Ion exchange and adsorption material methods are simple to apply, cost-effective, environmentally friendly technologies which are quite efficient at removing ammonium from treated water. The review presents a list of adsorbents from the literature, their adsorption capacities and other parameters needed for ammonium removal. Further, the preparation of adsorbents with high ammonium removal capacities and new adsorbents is discussed in the context of their relative cost, removal efficiencies, and limitations. Efficient, cost-effective, and environmental friendly adsorbents for the removal of ammonium on a large scale for commercial or water treatment plants are provided. In addition, future perspectives on removing ammonium using adsorbents are presented.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EM00312F
Abstract: Passive s lers measurements, especially DET, contributed to understanding of nitrogen transformations and sediment heterogeneity influenced by benthic microalgae, rooted aquatic plants and/or diel light cycles. Measurement capabilities varied considerably, especially for NH 4 –N.
Publisher: Springer Science and Business Media LLC
Date: 18-11-2022
DOI: 10.1007/S11356-021-17511-5
Abstract: The treatment and control of cyanobacterial blooms using copper-based algaecides in water reservoirs have historically been used however, due to the adverse impact of copper on the environment, water authorities have been researching and studying new and innovative ways to control cyanobacterial blooms. Hydrogen peroxide has been investigated as an environmentally friendly alternative, and this research aims to determine the impact of water quality on its effectiveness based on the decay characteristics in different water s les. Natural water s les from South Australian reservoirs and river were used to evaluate hydrogen peroxide decomposition and provide a better strategy for water operators in using it as an algaecide. Our experiments show the dependency of hydrogen peroxide decomposition not only on water quality but also on the initial hydrogen peroxide dose. A higher initial hydrogen peroxide dose can trigger the increase of pH, leading to increased consumption of hydrogen peroxide. In addition, the hydrogen peroxide decomposition is significantly accelerated with the rise of copper concentration in water s les. Moreover, it is found that UV light can also affect the decomposition rate of hydrogen peroxide. The hydrogen peroxide decay is more significant under UV light for the s les with lower hydrogen peroxide concentrations. Our study also shows the impact of dissolved organic carbon (DOC) on hydrogen peroxide decomposition is not substantial. The study also presents a modelling method to optimise hydrogen peroxide application based on water quality characteristics. Our findings can provide knowledge for the water industry to produce a suitable model which can be used to optimise the application of hydrogen peroxide for the control of cyanobacteria.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: CSIRO Publishing
Date: 20-02-2023
DOI: 10.1071/EN22107
Abstract: Environmental context Nitrate (NO3−) and ammonium (NH4+) are the most important soil nitrogen forms for plant growth. However, conventional extraction techniques may introduce artefacts affecting the measurement of plant-available N concentrations following s ling and s le preparation processes. This is the first study of the DGT technique being used to measure NO3-N and NH4-N in a wide range of soils, compared with conventional KCl extraction, and examined different factors that contribute to the plant-availability of these ions in soils. The knowledge would help to optimise soil nitrogen management practices, increase economic benefits and reduce environmental impacts. Rationale The availability of soil nitrogen for plant uptake can be affected by numerous soil factors such as soil texture, moisture and organic matter content, temperature and microbial activity. Conventional extraction techniques may affect the measurement of plant-available N concentrations following s ling and s le preparation processes, including drying, sieving, homogenising, freezing and thawing. The diffusive gradients in thin-films (DGT) technique can overcome some limitations of the conventional extraction techniques and has been used to successfully estimate the plant-available fractions of nutrients, such as P, K, Zn, Cu and Mn in soils. Therefore, it is important to evaluate the use of DGT for measuring NO3− and NH4+ in a wide variety of soils and examine the factors that contribute to the plant-availability of these ions in soils. Methodology The experiment evaluated the ability of the DGT technique to measure NO3-N and NH4-N in soils using binding layers containing A520E anion exchange resin or Microlite® PrCH cation exchange resin, respectively. The DGT results were compared to those from conventional KCl extraction. Results The A520E- and PrCH-DGTs showed good detection limits for NO3-N (6.90 µg L−1) and NH4-N (6.23 µg L−1) and were able to measure potentially available NO3-N and NH4-N in unfertilised soils. The mass of NO3-N and NH4-N that accumulated on the DGT device increased linearly across soil concentrations ranging from 5 to 300 mg kg−1 NO3-N (depending on soil type) and 5–300 mg kg−1 NH4-N which is equivalent to fertiliser rates of 75–450 kg ha−1 N. DGTs were used to measure potentially available NO3-N and NH4-N in ten soils with various physical and chemical properties. The DGT results were compared with conventional KCl extraction used to determine soil mineral N. DGT and KCl extraction measured values were significantly correlated with each other for NO3-N (R2 = 0.53 P-value 0.001), but the relationship between the two measurements was weaker for NH4-N (R2 = 0.20, P-value = 0.045). Discussion The results suggest that the two methods s le different N pools in the soils, with DGT targeting the NO3-N and NH4-N that are available in soil pore water and attached to labile solid phases.
Publisher: American Chemical Society (ACS)
Date: 07-06-2019
DOI: 10.1021/ACSSENSORS.9B00768
Abstract: Ammonia is a necessary monitoring parameter that should be controlled within an optimum range in the whole process of wastewater treatment and recycling, but few reliable real-time monitoring technologies are available currently under such harsh water conditions. This study proposes a continuous conductometric flow-through analyzer for ammonia monitoring (CFAA) in the wastewater treatment process. It is developed based on the gas diffusion mechanisms, and the proposed analytical principle has been validated in which the real-time conductivity increment rate is linearly proportional to the real-time ammonia concentration in the s le. This method could be generally applicable in monitoring a wide ammonia concentration range (10.2 μg L
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6EM00260A
Abstract: Commercially-available AMI-7001 anion exchange and CMI-7000 cation exchange membranes were utilised as binding layers for DGT measurements of NO 3 –N and NH 4 –N in freshwaters.
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.JENVMAN.2022.114858
Abstract: There is limited understanding of how constructed wetland (CW) water quality may change over time in response to increased wastewater nutrient and hydraulic loadings. We evaluated long-term water quality trends and drivers for a full-scale (8.19 ha) free water surface CW that was developed in 2001 for the treatment of increasing amounts of pre-treated domestic wastewater from the township of Mount Barker, South Australia. Water quality parameter concentrations and loads, hydraulic loadings rates, trend direction assessments (TDAs), and water quality parameter removal efficiencies were analysed over the study period. The wetland received an annual average loading rate of 947, 19644, 31039, 18140, 2985, and 807 kg year
Publisher: American Chemical Society (ACS)
Date: 28-01-2021
Publisher: American Chemical Society (ACS)
Date: 11-03-2022
Location: Australia
Location: Australia
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