Institute of Hydrogeology and Environmental Geology,
Chinese Academy of Geological Sciences
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Groundwater Science and Engineering LimitedPublish
2021 Vol. 9, No. 2
Article Contents

Li Yue-nan, Gu Yan-sheng, Li Man-zhou, Huo Guang-jie, Wang Xi-ping, Xu Zhi-jie, Yue Jie, Du Dan, Geng Man-ge. 2021. Comparison on the phytoextraction efficiency of Bidens pilosa at heavy metal contaminated site in natural and electrokinetic conditions. Journal of Groundwater Science and Engineering, 9(2): 121-128. doi: 10.19637/j.cnki.2305-7068.2021.02.004
Citation: Li Yue-nan, Gu Yan-sheng, Li Man-zhou, Huo Guang-jie, Wang Xi-ping, Xu Zhi-jie, Yue Jie, Du Dan, Geng Man-ge. 2021. Comparison on the phytoextraction efficiency of Bidens pilosa at heavy metal contaminated site in natural and electrokinetic conditions. Journal of Groundwater Science and Engineering, 9(2): 121-128. doi: 10.19637/j.cnki.2305-7068.2021.02.004

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

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  • 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.

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