The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil
Chemical fractionation procedures were used to quantify the effect of the sediment redox and pH conditions on the adsorption and solubility of arsenic (As) in municipal sewage sludge and sewage sludge-amended soil. Sludge and sludge-amended soil were incubated in microcosms in which EhpH conditions...
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th-mahidol.254132018-09-07T15:50:27Z The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil A. Carbonell-Barrachina A. Jugsujinda R. D. DeLaune W. H. Patrick F. Burló S. Sirisukhodom P. Anurakpongsatorn Louisiana State University Universidad Miguel Hernandez de Elche Mahidol University Kasetsart University Environmental Science Chemical fractionation procedures were used to quantify the effect of the sediment redox and pH conditions on the adsorption and solubility of arsenic (As) in municipal sewage sludge and sewage sludge-amended soil. Sludge and sludge-amended soil were incubated in microcosms in which EhpH conditions were controlled. Samples were sequentially extracted to determine As in various chemical forms (water soluble, exchangeable, bound to carbonates, bound to iron (Fe) and manganese (Mn) oxides, bound to insoluble organics and sufides) and the chemically inactive fraction (mineral residues). In both sewage sludge and sludge-amended soil, As chemistry was governed by large molecular humic matter and sulfides and Fe and Mn-oxides. Solubility of As remained low and constant under both aerobic and anaerobic conditions in sludge-amended soil. After dissolution of Fe and Mn-oxides, As5+was released into sludge solution, reduced to As3+and likely precipitated as sulfide. Therefore, an organic amendment rich in sulfur compounds, such as sewage sludge, would drastically reduce the potential risks derived from As pollution under highly anoxic conditions by precipitation of this toxic metalloid as insoluble and immobile sulfides. 2018-09-07T08:50:27Z 2018-09-07T08:50:27Z 1999-01-01 Article Environment International. Vol.25, No.5 (1999), 613-618 10.1016/S0160-4120(99)00027-6 18736750 01604120 2-s2.0-0033165922 https://repository.li.mahidol.ac.th/handle/123456789/25413 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033165922&origin=inward |
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Environmental Science A. Carbonell-Barrachina A. Jugsujinda R. D. DeLaune W. H. Patrick F. Burló S. Sirisukhodom P. Anurakpongsatorn The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
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Chemical fractionation procedures were used to quantify the effect of the sediment redox and pH conditions on the adsorption and solubility of arsenic (As) in municipal sewage sludge and sewage sludge-amended soil. Sludge and sludge-amended soil were incubated in microcosms in which EhpH conditions were controlled. Samples were sequentially extracted to determine As in various chemical forms (water soluble, exchangeable, bound to carbonates, bound to iron (Fe) and manganese (Mn) oxides, bound to insoluble organics and sufides) and the chemically inactive fraction (mineral residues). In both sewage sludge and sludge-amended soil, As chemistry was governed by large molecular humic matter and sulfides and Fe and Mn-oxides. Solubility of As remained low and constant under both aerobic and anaerobic conditions in sludge-amended soil. After dissolution of Fe and Mn-oxides, As5+was released into sludge solution, reduced to As3+and likely precipitated as sulfide. Therefore, an organic amendment rich in sulfur compounds, such as sewage sludge, would drastically reduce the potential risks derived from As pollution under highly anoxic conditions by precipitation of this toxic metalloid as insoluble and immobile sulfides. |
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Louisiana State University |
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Louisiana State University A. Carbonell-Barrachina A. Jugsujinda R. D. DeLaune W. H. Patrick F. Burló S. Sirisukhodom P. Anurakpongsatorn |
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Article |
author |
A. Carbonell-Barrachina A. Jugsujinda R. D. DeLaune W. H. Patrick F. Burló S. Sirisukhodom P. Anurakpongsatorn |
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A. Carbonell-Barrachina |
title |
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
title_short |
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
title_full |
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
title_fullStr |
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
title_full_unstemmed |
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil |
title_sort |
influence of redox chemistry and ph on chemically active forms of arsenic in sewage sludge-amended soil |
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2018 |
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https://repository.li.mahidol.ac.th/handle/123456789/25413 |
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1763491336912109568 |