EDTA辅助小藜修复Pb及Pb-Cd复合污染土壤的研究

通过盆栽试验,研究了Pb及Pb-Cd复合污染土壤添加EDTA(乙二胺四乙酸)对小藜生长和转运、富集Pb、Cd的影响。结果表明,高浓度的EDTA对小藜的生长有抑制作用,Pb及Pb-Cd复合处理下EDTA最佳添加浓度均为2.5mmol·kg-1,此时小藜对Pb的转运系数达2.66和2.41,富集系数达1.51和1.82,分别比对照提高554%和493%、8431%和2367%;对Cd的转运系数达1.87和3.47,富集系数达1.78和10.8,分别比对照提高165%和355%、77%和283%。2.5mmol·kg-1EDTA辅助小藜修复Pb-Cd复合污染土壤的效果优于修复Pb污染土壤的效果。

EDTA Assisted Phytoremediation of Chenopodium serotinum L. for Pb and Pb-Cd Contaminated Soil

An outdoor pot experiment was conducted to study the effect of EDTA on the phytoremediation of Pb and Cd by Chenopodium serotinum L. The results revealed that 10 mmol·kg~(-1) EDTA was harmed for Chenopodium serotinum L. 2.5 mmol·kg~(-1) was the best EDTA concentration for phytoremediation. On Pb and Pb-Cd contaminated soil. TF of Pb were markedly enhanced to 2.66 and 2.41, BCF were markedly enhanced to 1.51 and 1.82, were respectively augmented 554%, 493%, 8 431% and 2 367% by 2.5 mmol·kg~(-1) EDTA in comparison with the blank tests. TF of Cd were markedly enhanced to 1.87 and 3.47, BCF were markedly enhanced to 1.78 and 10.8, were respectively augmented 165%,355%, 77% and 283% by 2.5 mmol·kg~(-1) EDTA in comparison with the blank tests. 2.5 mmol·kg~(-1) EDTA assisted phytore-mediation of Chenopodium serotinum L for Pb-Cd contaminated soil was more effective than Pb contaminated soil.