Chelator enhanced phytoextraction of Cr and Ni by Indian mustard grown on serpentine-mine tailings
This study compares the effect of synthetic aminopolycarboxylic acids EDTA and DTPA with natural low-molecular-weight organic acids (LMWOAs) oxalic acid and citric acid as chelators for enhancing phytoextraction of Cr and Ni by Indian mustard (Brassica juncea) on serpentine-mine railings. The chelator treatments were applied at doses of 0.05 and 0.10 mmol/kg dry soils in the pots for 56 days. Experimental results indicate that EDTA and DTPA were much more efficient than LMWOAs in increasing Cr and Ni concentrations in the soil solutions over time. However, the reduction of plant shoot biomass by the two synthetic chelators is greater than that by the LMWOAs. The present results supported the use of chelators for Cr and Ni extracted by Indian mustard and thus reached the goals in inducing removal of substantial amounts of Cr and Ni from serpentine-mine railings. Using EDTA and DTPA for enhancing phytoextraction not only leads to low production of plant biomass but also associats with environment rise Therefore, the addition of LMWOAs in phytoremediation could provide an environmentally compatible alternative in the future.
Chelator Heavy metals Indian mustard Phytoextraction Serpentine-mine railings
Z. Y. Hseu K. S. Shiao
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
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
1014-1015
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）