Title: Effects of Dissolved Organic Matter and pH on Toxicity and Bioavailability of Lead
Abstract: The germination test was carried out to study the effect of different organic ligands citric acid(CA),malic acid(MA),oxalic acid(OA),ethylenediamine tetra-acetic acid(EDTA),diethylenetriamine penta-acetic acid(DTPA),humic acid(HA) and soil extract(A) on toxicity and bioavailability of Pb2+ and its uptake by mustard.Mustard seeds were exposed to solutions containing Pb2+ and several kinds of dissolved organic matters,and the root lengths and the concentration of Pb2+ in mustard sprouts were measured.The results indicated that low molecular weight organic acids(citric and malic acids) decreased the toxicity of Pb2+ and increased its bioavailability.Low concentrations of the synthetic chelators ethylenediamine tetra-acetic acid(EDTA),oxalic acid(OA) and diethylenetriamine penta-acetic acid(DTPA) decreased the toxicity and bioavailability of Pb2+.In contrast,humic acid increased the toxicity of Pb2+ and decreased the bioavailability of Pb2+.The toxicity and the bioavailability of lead increased at pH5,while decreased at pH5.Consequently,the bioavailability and toxic effects of Pb2+ in soil depended on the nature of coexisting organic substances in the soil solution and the pH of soil solution.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 1
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