Phytoextraction of Pb and Cu contaminated soil with maize and microencapsulated EDTA |
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Authors: | Xie Zhiyi Wu Longhua Chen Nengchang Liu Chengshuai Zheng Yuji Xu Shengguang Li Fangbai Xu Yanling |
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Institution: | Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China. |
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Abstract: | Chelate-assisted phytoextraction using agricultural crops has been widely investigated as a remediation technique for soils contaminated with low mobility potentially toxic elements. Here, we report the use of a controlled-release microencapsulated EDTA (Cap-EDTA) by emulsion solvent evaporation to phytoremediate soil contaminated with Pb and Cu. Incubation experiments were carried out to assess the effect of Cap- and non-microencapsulated EDTA (Ncap-EDTA) on the mobility of soil metals. Results showed EDTA effectively increased the mobility of Pb and Cu in the soil solution and Cap-EDTA application provided lower and more constant water-soluble concentrations of Pb and Cu in comparison with. Phytotoxicity may be alleviated and plant uptake of Pb and Cu may be increased after the incorporation of Cap-EDTA. In addition phytoextraction efficiencies of maize after Cap- and Ncap-EDTA application were tested in a pot experiment. Maize shoot concentrations of Pb and Cu were lower with Cap-EDTA application than with Ncap-EDTA. However, shoot dry weight was significantly higher with Cap-EDTA application. Consequently, the Pb and Cu phytoextraction potential of maize significantly increased with Cap-EDTA application compared with the control and Ncap-EDTA application. |
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Keywords: | soil Pb Cu phytoremediation maize microencapsulated EDTA |
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