Publication: The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil
Issued Date
1999-01-01
Resource Type
ISSN
18736750
01604120
01604120
Other identifier(s)
2-s2.0-0033165922
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Environment International. Vol.25, No.5 (1999), 613-618
Suggested Citation
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. Environment International. Vol.25, No.5 (1999), 613-618. doi:10.1016/S0160-4120(99)00027-6 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/25413
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Title
The influence of redox chemistry and pH on chemically active forms of arsenic in sewage sludge-amended soil
Abstract
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.