Adsorption and mobility of Cr(III)-organic acid complexes in soils |
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Authors: | Cao Xinhua Guo Jing Mao Jingdong Lan Yeqing |
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Affiliation: | a College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China b Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529, USA |
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Abstract: | The soluble Cr(III) is likely to be complexed with organic ligands in ligand-rich soil. Cr(VI) chemical reduction by organic acids and bioreduction by microorganisms can produce soluble Cr(III)-organic acids complexes. Thus, it is of great significance to investigate the absorption and mobility of Cr(III)-organic acid complexes in soils. In this study, Cr(III)-EDTA and Cr(III)-cit were prepared and purified, and then were examined for adsorption and mobility. The results demonstrated that Cr(III) was strongly bound to soil, while Cr(III)-organic acid complexes had no or slight interaction with soils since Cr(III)-EDTA and Cr(III)-cit complexes mainly existed as the forms of Cr(III)-EDTA]− and Cr(III)-cit], respectively, under the tested conditions with initial pH 4.0-9.0. The adsorption of Cr(III) increased but that of Cr(III)-organic acid complexes decreased with the content of soil organic matter. Compared with Cr(III)-EDTA, the mobility of Cr(III)-cit in soil columns was reduced, due to the specific adsorption between soils and Cr(III)-cit which contained one free hydroxyl group. |
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Keywords: | Cr(III) Cr(III)-organic acid complex Adsorption Mobility |
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