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Title: Inorganic arsenic sorption by drinking-water treatment residual-amended sandy soil: effect of soil solution chemistry
Authors: Nagar, Rachana 
Sarkar, Dibyendu 
Datta, Rupali K. 
Makris, Konstantinos C. 
Keywords: Arsenic;Batch incubation;Drinking-water treatment residuals;Remediation;Sorption
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: Jan-2013
Source: International Journal of Environmental Science and Technology, 2013, Volume 10, Issue 1, Pages 1-10
Abstract: Previous studies in our laboratory have demonstrated that drinking-water treatment residuals are effective sorbents of arsenic V. However, the effect of soil solution chemistry on arsenic V sorption by drinking-water treatment residuals-amended soils remains to be explored. The current study uses a batch incubation experimental set up to evaluate the effect of soil solution pH, competing ligands, and complexing metal on arsenic V sorption by a sandy soil (Immokalee series) amended with two rates (25 and 50 g kg-1) of aluminum and iron-based drinking-water treatment residuals. Experiments were conducted at three initial arsenic loads (125, 1,875, 3,750 mg kg-1) and a constant solid: solution ratio of 200 g L-1. An optimum equilibration time of 8 days, obtained from kinetic studies, was utilized for sorption experiments with both aluminum and iron drinking-water treatment residual-amended soil. Presence of phosphate decreased arsenic V sorption by both aluminum and iron drinking-water treatment residual amended soils, with a strong dependence on pH, drinking-water treatment residual types, drinking-water treatment residual application rates, and phosphate concentrations. Addition of sulfate had no effect on arsenic V sorption by aluminum or iron drinking-water treatment residual-amended soil. A complementing effect of calcium on arsenic V sorption was observed at higher pH. Results elucidating the effect of soil solution chemistry on the arsenic V sorption will be helpful in calibrating drinking-water treatment residual as a sorbent for remediation of arsenic-contaminated soils.
ISSN: 1735-2630
DOI: 10.1007/s13762-012-0106-y
Rights: © CEERS, IAU.
Type: Article
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