Comparison on the phytoextraction efficiency of Bidens pilosa at heavy metal contaminated site in natural and electrokinetic conditions  

作　　者：Yue-nan Li Yan-sheng Gu Man-zhou Li Guang-jie Huo Xi-ping Wang Zhi-jie Xu Jie Yue Dan Du Man-ge Geng 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China [2]Natural Resources Monitoring Institute of Henan Province,Zhengzhou 450016,China

出　　处：《Journal of Groundwater Science and Engineering》2021年第2期121-128,共8页地下水科学与工程（英文版）

基　　金：This study was financially supported by Henan Land and Resources Department(2011-622-38).

摘　　要：The plant samples of Bidens pilosa were collected from a coal gangue vacant site and its surrounding area,located in central China,to study the remediation effect of the plant species on heavy metal(HM)contamination in both natural and electrokinetic(EK)conditions.The analytical results showed that the effect of phytoextraction and bioconcentration on the heavy metals in the sample of the EK group is more significant than those in the other control group.Compared with the results of natural condition,under the EK condition the concentrations of cadmium(Cd),lead(Pb),copper(Cu)and zinc(Zn)in the stems and leaves of the Bidens pilosa increased to 0.40 mg/kg,4.23 mg/kg,7.27 mg/kg,830.24 mg/kg,respectively,with their increments of 292%,1731%,141%,2076%.For root samples,the Cd,Pb,Cu and Zn concentrations increased to 0.52 mg/kg,4.36 mg/kg,10.87 mg/kg,and 98.12 mg/kg and the increase rates were 1034%,140%,29%,and 181%,respectively.The phytoextraction efficiency of the Bidens pilosa was significantly higher than that of control group.The removal efficiency of Cd,Pb,Cu and Zn in soil increased to 26%,72%,27%,and 79%with the EK applied.In addition,the mechanism of HM migration,extraction and enrichment in Bidens pilosa under the EK condition was discussed.

关 键 词：ELECTROKINETIC Heavy metal Bidens pilosa Coal gangue area PHYTOEXTRACTION 

分 类 号：X173[环境科学与工程—环境科学]