Effects of Hematite Nanoparticles and Acrylic Copolymer Adsorbents on Distribution of Arsenic Fractions in Soil

Authors

1 PhD. Student, Department of Soil Science, College of Agriculture, University of Zanjan

2 Professor, Department of Soil Science, College of Agriculture, University of Zanjan. Chief Director of the Novin Shimyar Lab, Tehran

3 Chief director of the novin Shimyar lab, Tehran

4 Assistant Professor, Department of Geology, College of Science, University of Zanjan

Abstract

Arsenic (As) is one of the heavy metals whose contamination of soil and groundwater is common and disturbing. Therefore reducing the concentrations of labile fractions of arsenic is very important, because these fractions are bioavailable. This study was carried out to evaluate the effects of hematite nanoparticles (α-Fe2O3) and maleic anhydride - styrene - acrylic acid copolymer on motility of arsenic in contaminated soils and arsenic distribution in different fractions in soil. For this purpose, an experiment was conducted using a completely randomized design and three replications. Two types of adsorbents including hematite nanoparticles and maleic anhydride - styrene - acrylic acid copolymer were applied at the rate of 0.2 percent in a soil contaminated with 96 mg As/kg. The structure and properties of the nanoparticles were determined using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The effects of adsorbents on arsenic mobility and distribution in soil were assessed by sequential extraction method and using ICP devices. Imaging of hematite nanoparticles showed that the mean diameter of the particles was 32.69 nm and their morphology was spherical. The results showed that the effects of adsorbents on the concentrations of non-specifically and specifically sorbed arsenic, amorphous and poorly-crystalline hydrous oxides of Fe and Al, well-crystallized hydrous oxides of Fe and Al and residual phases were significant. Application of adsorbents decreased the concentrations of non-specifically and specifically sorbed arsenic and hematite nanoparticles had more efficiency. The reduction in the concentrations of non-specifically sorbed (available) arsenic at the application rate of 0.2% of the hematite nanoparticles and acrylic copolymer were 65.31% and 62.54%, respectively. A sharp increase was observed in the concentrations of poorly and well-crystalline hydrous oxides of Fe and Al by application of hematite nanoparticles. Also, the concentration of residual arsenic sharply increased by application of acrylic copolymer. Hematite nanoparticles and acrylic copolymer immobilized arsenic in the soil by changing its distribution.

Keywords

References

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Iranian Journal of Soil Research
Volume 31, Issue 1
June 2017
Pages 89-101

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