Cu and Zn Speciation in an Acid Soil Amended withAlhalline BiosolidsEnglish Full Text

LUO YONGMINGInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)

Abstract: Fractionation of metals in a granite-derived acid sandy loam soil amended with alkaline-stabilised sewagesIudge biosolids was conducted in order to assess metal bioavailability and environmental mobility Soilsolution was extracted by a centrifugation and filtration technique. Metal speciation in the soil solution wasdetermined by a cation exchange resin method. Acetic acid and EDTA extracting solutions were used forextraction of metals in soil solid surfaces. Metal distribution in different fractions of soil solid phase wasdetermined using a three-step sequential extraction scheme. The results show that the metals in the soilsolution existed in different fractions with variable lability and metals in the soil solid phase were also presentin various chemical forms with potentially different bioavailability and environmental mobility Alkaline-stabilised biosolids could elevate solubility of Cu and proportion of Cu in organically complexed fractionsboth in soil liquid and solid phases, and may therefore increase Cu mobility. In contrast, the biosolidslowered the concentrations of water-soluble Zn （labile fraction） and exchangeable Zn and may hence decreasebioavailability and mobility of Zn. However, Fe and Mn oxides bound and organic matter bound fractions arelikely to be Zn pools in the sludge-amended soil. These consequences possibly result from the liming effectand metal speciation of the sludge product and the difference in the chemistry between the metals in soil.

Keywords：

alkaline-stabilised sewage sludge; chemical speciation; Cu; granite soil; Zn;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Cu and Zn Speciation in an Acid Soil Amended withAlhalline BiosolidsEnglish Full Text

LUO YONGMINGInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)

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