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- W2113460986 abstract "Abstract Two soils amended with a sewage sludge were incubated at two ambient temperatures (15°C and 25°C) under greenhouse conditions for two years. Representative samples of the sewage sludge and periodically collected soil samples were subjected to an operationally-defined sequential extraction procedure. This procedure fractionated metals in three broad fractions through the use of CH3COOH, NH2OH·DHCl and H2O2 in sequence. In the sludge, the greatest percentages (63–98%) of the five metals studied (Cd, Cu, Ni, Pb and Zn) were extracted by H2O2NH4OAc. The application of sludge to soils substantially increased the contents of metals in all the three fractions. Cadmium, Ni and Zn in the sludge-amended soils were predominantly in the CH3COOH extractable fraction while Cu and Pb were extracted primarily by H2O2/NH4OAc. The contents of Cd, Cu, Pb and Zn extractable by CH3COOH increased in samples collected over a period of two years while that of Ni did not show any significant change. Metal concentrations extractable by NH2OH·DHCI remained more or less constant over the residual period. Metal contents extracted in H2O2NH4OAc decreased considerably during the first year before stabilising for the rest of the study period. The different incubation temperatures had no obvious effect on CH3COOH and NH2OH·DHCl extractable metal fractions. However, the observed decline in metal contents, over time, extracted by H2O2/NH4OAc was faster in samples collected from the warm environment (25°C) than those from cooler conditions (15°C). The observed trend of increasing metal concentrations in CH3COOH- extractable fraction and decrease in the H2O2/NH4OAc fraction coincided with decreasing soil organic matter status due to microbial oxidation of sludge-added organic matter. The importance of trace metal fractionation and transformation between fractions are discussed." @default.
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- W2113460986 date "1994-12-01" @default.
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- W2113460986 title "Changes in Operational Fractions of Trace Metals in Two Soils During Two-Years of Reaction Time Following Sewage Sludge Treatment" @default.
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- W2113460986 doi "https://doi.org/10.1080/03067319408027462" @default.
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