ORCID Profile
0000-0002-5551-7002
Current Organisations
Ferdowsi University of Mashhad Faculty of Agriculture
,
University of Adelaide
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Publisher: Springer Science and Business Media LLC
Date: 04-05-2012
DOI: 10.1007/S12011-012-9434-5
Abstract: Two experiments were done in 2008 and 2009 to study the effects of magnetic field and silver nanoparticles on fodder maize (Zea mays L.). These experiments were done with seven treatments based on a randomized complete block design in four replications. The treatments were as follows: magnetic field and silver nanoparticles + Kemira fertilizer (T1), magnetic field and silver nanoparticles + Humax fertilizer (T2), magnetic field and silver nanoparticles (T3), Kemira fertilizer (T4), Librel fertilizer (T5), Humax fertilizer (T6), and a control (T7). Results showed that fresh yield was higher in treatments T3 and T4. Treatments T3 and T4 had increased maize fresh yields of 35 and 17.5 % in comparison to the control, respectively. The dry matter yield of those plants exposed to magnetic field and silver nanoparticles was significantly higher than that from any of the other treatments. Magnetic field and silver nanoparticle treatments (T3 and T1) showed higher percentages for ears, and the lowest percentages were found in treatments T7 and T5. In general, the soil conditions for crop growth were more favorable in 2009 than in 2008, which caused the maize to respond better to treatments tested in the study therefore, treatments had more significant effects on studied traits in 2008 than in 2009.
Publisher: Informa UK Limited
Date: 18-03-2014
Publisher: Informa UK Limited
Date: 25-12-2019
Publisher: CSIRO Publishing
Date: 1997
DOI: 10.1071/S96079
Abstract: The bioavailability of trace metals, their accumulation by organisms, and their toxicity to terrestrial and aquatic organisms can be understood better in terms of trace metal species. Although there are numerous chemical techniques used for the determination of ionic species, most are tedious, time-consuming, and not practical for routine analyses. Alternatives to these chemical techniques are computer speciation models that often have an incomplete database on metal–organic chemistry, yet scientists continue to use these techniques for estimation of trace metal activities. In this study we compare the cation exchange resin (Amberlite) and the MINTEQA2 geochemical model for the speciation of zinc (Zn2+) and copper (Cu2+) in the aqueous phase of 11 soils varying widely in chemical composition. The pHw(1:5) of these soils ranged from 5·3 to 9·1, while the total soil aqueous phase concentrations of Zn and Cu were in the ranges 1–71 and 5–74 µg/L, respectively. Preliminary equilibration studies revealed that 24-h contact between resin and s le solution was sucient to exchange all free ions onto the resin bead. By using this equilibration time, the effects of temperature, solution composition, and pH on the resin distribution coeficients (Kd) for Zn and Cu were investigated. These studies revealed that temperature did not significantly influence the Zn and Cu resin distribution coecient. Solution composition such as the presence of Ca, Mg, and Al, however, had a marked effect on the Kd value. Although the Kd value was not sensitive to changes in solution pH (4·5–7·1), it increased at pH ·1. These results suggest that soil solution composition must be considered during metal ion speciation using the resin beads. Changes in Zn and Cu concentrations, however, did not influence the Kd values of these metals. The cation exchange resin method was modified for speciation of solutions containing very low concentration ( µg/L) of Zn. Comparison of the 2 speciation techniques demonstrated excellent agreement for free hydrated Zn2+ and Cu2+ in the soils studied.
Publisher: Informa UK Limited
Date: 16-03-2018
Publisher: Informa UK Limited
Date: 27-12-2016
Publisher: Pleiades Publishing Ltd
Date: 05-2017
Publisher: Elsevier BV
Date: 06-2014
Publisher: Elsevier BV
Date: 06-2014
Publisher: Wiley
Date: 13-11-2018
DOI: 10.1111/EJSS.12735
Publisher: Walter de Gruyter GmbH
Date: 2018
Abstract: This study investigated the impact of monovalent cations on clay dispersion, aggregate stability, soil pore size distribution, and saturated hydraulic conductivity on agricultural soil in Iran. The soil was incubated with treatment solutions containing different concentrations (0-54.4 mmol l −1 ) of potassium and sodium cations. The treatment solutions included two levels of electrical conductivity (EC=3 or 6 dS m −1 ) and six K:Na ratios per electrical conductivity level. At both electrical conductivity levels, spontaneously dispersible clay increased with increasing K concentration, and with increasing K:Na ratio. A negative linear relationship between percentage of water-stable aggregates and spontaneously dispersible clay was observed. Clay dispersion generally reduced the mean pore size, presumably due to clogging of pores, resulting in increased water retention. At both electrical conductivity levels, hydraulic conductivity increased with increasing exchangeable potassium percentage at low exchangeable potassium percentage values, but decreased with further increases in exchangeable potassium percentage at higher exchangeable potassium percentage. This is in agreement with earlier studies, but seems in conflict with our data showing increasing spontaneously dispersible clay with increasing exchangeable potassium percentage. Our findings show that clay dispersion increased with increasing K concentration and increasing K:Na ratio, demonstrating that K can have negative impacts on soil structure.
Publisher: Elsevier BV
Date: 06-1998
Publisher: Wiley
Date: 02-05-2019
Publisher: Springer Science and Business Media LLC
Date: 07-10-2011
DOI: 10.1007/S12011-011-9222-7
Abstract: The impacts of different concentrations of bulk and nanosized TiO(2) on seed germination and seedling growth of wheat were studied in a randomized completely design with four replications in the College of Agriculture, Ferdowsi University of Mashhad, Iran, in 2011. The experimental treatments included five concentrations of bulk (1, 2, 10, 100, and 500 ppm), five concentrations of nanosized TiO(2) (1, 2, 10, 100, and 500 ppm), and control (without any TiO(2)). Results indicated that among the wheat germination indices, only mean germination time was affected by treatments. The lowest and the highest mean germination time (0.89 vs. 1.35 days) were obtained in 10 ppm concentration of nanosized TiO(2) and control treatments, respectively. In addition, shoot length, seedling length, and root dry matters were affected by bulk and nanosized TiO(2) concentrations, significantly. Shoot and seedling lengths at 2 and 10 ppm concentrations of nanosized TiO(2) were higher than those of the untreated control and bulk TiO(2) at 2 and 10 ppm concentrations. Employing nanosized TiO(2) in suitable concentration could promote the seed germination of wheat in comparison to bulk TiO(2) but in high concentrations had inhibitory or any effect on wheat.
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.SCITOTENV.2019.01.345
Abstract: Understanding the transport behaviour of new and emerging materials such as engineered nanoparticles (ENPs) is vital for the accurate assessment of their functionality and fate in environmental systems. Predicting ENP mobility in soil systems based on common attributes of either soil or ENPs is of significant interest as an alternative to conducting laborious and time consuming column experiments. Thus this study investigates the importance of different soil properties and experimental conditions on titanium dioxide nanoparticles (nTiO
Publisher: Springer Science and Business Media LLC
Date: 12-2017
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 04-2009
Publisher: Springer Science and Business Media LLC
Date: 23-06-2022
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.ECOENV.2017.06.074
Abstract: There is a gap of knowledge for the fate, effects and bioavailability of coated and uncoated ZnO nanoparticles (NPs) in soil. Moreover, little is known about the effects of soil properties on effects of NPs on plants. In this study, the availability ZnO NPs in two soils with different organic matter content (one treated with cow manure (CM) and the other as untreated) was compared with their bulk particles. Results showed that coated and uncoated ZnO NPs can be more bioaccessible than their bulk counterpart and despite their more positive effects at low concentration (< 100mgkg
Publisher: Informa UK Limited
Date: 21-12-2017
Publisher: Elsevier BV
Date: 05-2014
DOI: 10.1016/J.JHAZMAT.2014.03.054
Abstract: This study investigated the effectiveness of 6 different types of naturally occurring manganese, aluminum and iron oxides for stabilization of As and Sb in a calcareous soil spiked with 50mgkg(-1) of As or Sb and two dosages of treatments (2% and 5%). The resulting contaminated soils were subjected to a series of chemical extraction studies including sequential extraction, single step extraction with DTPA and Simplified Bioaccessibility Extraction Test (SBET) for estimation of bioaccessible fraction of As and Sb in soil and a greenhouse experiment using barley as the test crop. The results showed that Fe-associated and carbonate-bound fraction of As and Sb were predominant fractions. However, the amounts of labile fractions were higher in As contaminated soils, whereas the percentage of Sb associated with crystalline Fe-oxide and residual fractions were higher. The results revealed that application of natural metal oxides reduced DTPA and SBET extractable amounts and plant uptake of As and Sb. After application of amendments, the exchangeable fraction of As decreased dramatically by up to 82% while Sb exchangeable fraction decreased by up to 60% depending upon the additive. The results of chemical extractions and plant uptake confirmed that Sb had lower bioavailability, compared with As.
Publisher: Informa UK Limited
Date: 21-04-2018
Publisher: Elsevier BV
Date: 04-2009
Publisher: Elsevier BV
Date: 06-2019
Publisher: CSIRO Publishing
Date: 1997
DOI: 10.1071/S96086
Abstract: The effect of dilution on the composition of soil solutions of 8 contrasting soils ranging in pH from 5·3 to 8·8 with reference to zinc (Zn) and copper (Cu) was studied. Soil s les were equilibrated with water in various water:soil ratios for 24 h. Equilibrium solutions were extracted and analysed for dissolved organic carbon (DOC), and major and minor elements. The separation of the soil solution at field capacity (FC) was carried out by a drainage method. Although the concentration of ions decreased upon dilution, the total quantity of sodium (Na), potassium (K), Zn, Cu, and DOC extracted per unit of soil weight increased. In contrast, the total quantity of Ca and Mg decreased in most soils. The ratio of Zn and Cu to Ca correlated to dilution level, whereas the ratio of Zn to monovalent cations decreased in low pH soils. The relationship between the quantity of Zn and Cu at different levels of the water : soil ratio in the soils studied showed that the concentration of these trace metals at FC soil moisture can be estimated from the soil extract. Increases in soil moisture content led to a marked change in the ion-pair, free hydrated metal concentrations, and complexation. Log Zn2+ was linearly related to solution pH. Zinc solubility was not consistent with published solubilities of any common minerals. Also, Zn solubility in alkaline soils tended to be higher than reported values in the literature, indicating that soluble metal–organic ligand complexation was underestimated in these soils. The relationship between pH and log Zn2+ was affected by dilution in several ways.
Publisher: Canadian Science Publishing
Date: 03-2019
DOI: 10.1139/ER-2018-0022
Abstract: Transport and deposition behaviour of engineered nanoparticles (ENPs) in natural aquifers and soil systems is a key determinant of the fate of these materials in environmental systems. A growing number of experimental studies are being conducted worldwide to address transport and deposition of ENPs in porous media (PM). Here we comprehensively review the main mechanisms and factors affecting the mobility of the environmentally important ENPs in natural PM. A variety of different processes including those that promote mobility and result in elution from the PM and those that hinder their mobility and promote ENP retention can influence ENP’s mobility through soil and aquifer media. The most important contributing factors regarding ENP transport in PM include: the physicochemical properties of the ENP, the media, the hydrodynamics of the system, and the background solution characteristics. Results from several studies conducted on the most common and environmentally important ENPs have shown that under natural environmental conditions, different types of ENPs show different transport behaviour in soil and aquifer systems. Additionally, the importance of media matrix and mobile solution factors in governing mobility of ENPs varies from one type of ENP to another.
Publisher: Springer Science and Business Media LLC
Date: 04-10-2023
Publisher: Informa UK Limited
Date: 10-1996
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.JENVMAN.2018.06.061
Abstract: Nanotechnology is increasingly being used to remediate polluted soil and water. However, few studies are available assessing the potential of nanoparticles to bind surface particles, decrease erosion, and minimize the loading of water pollutants from agricultural surface discharge. To investigate this potential, we treated in situ field plots with two practical surface application levels of anionic polyacrylamide (PAM only) with and without nanomagnetite (PAM-NM), examined soil physical properties, and evaluated the impact of this amendment on contaminant sorption and soil erosion control. Polyacrylamide and PAM-NM treatments resulted in 32.2 and 151.9 fold reductions in Mn
Publisher: Informa UK Limited
Date: 17-03-2020
Location: Iran (Islamic Republic of)
No related grants have been discovered for Amir Fotovat.