The effect of earthworms on the fractionation and bioaccessibility of heavy metals before and after soil remediation
The effect of two earthworm species, Lumbricus rubellus and Eisenia fetida, on the fractionation/ bioaccessibility of Pb and Zn before and after soil leaching with EDTA was studied. Four leaching steps with a total of 12. 5 mmol · kg<1> EDTA removed 39.8％ and 6.1％ of Pb and Zn, respectively. EDTA removed Pb from all soil fractions fairly uniformly (assessed using sequential extractions). Zn was mostly present in the inert residual soil fraction, which explains its poor removal. Analysis of earthworm casts and the remainder of the soil indicated that L. rubellus and E. fetida did not significantly change Pb and Zn fractionation in non-remediated and remediated soil. However, the bioavaiiability of Pb (assessed using a physiologically based extraction test) in E. fetida casts was significantly higher than in the bulk of the soil. In remediated soil, Pb bioavailability in the simulated stomach phase increased by 5.1 times.
Bioavailability earthworms fraetionation heavy metals soil remediation
D. Lestan M. Udovic
Agronomy Department, Biotechnical Faculty, University of Ljubljana, Jarnnikarjeva 101, 1000 Ljubljana, Slovenia
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
627-628
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）