Mechanism for electric field enhancing remediation of uranium and cadmium co-contaminated soil by Macleaya cordata
HU Nan1, ZHU Ruo-nan1, CHENG Hao2, TAN Guo-chi2, DONG Xue2, ZHANG Hui1, MA Jian-hong1, WANG Yong-dong2, DING De-xin1
1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Henyang 421001, China; 2. Hunan Province Key Laboratory of Green Development Technology for Exetremely Low Grad Uranium Resources, University of South China, Henyang 421001, China
Abstract:Pot experiments were conducted to investigate variations in biomass, the accumulation performance of uranium and cadmium, and the antioxidant enzyme activities of Macleaya cordata, and in organic acid content, the speciation of uranium and cadmium, the valence state of uranium of the root, and the structure of microbe community in its rhizosphere soil under the application of DC electric field at 0.3V/cm. The results showed that the total biomass of Macleaya cordata was increased by 15.33%~29.88%, the accumulation coefficients of uranium and cadmium in DC+U and DC+Cd treatment groups were increased by 90.84% and 93.33% The proportion of available uranium and cadmium in rhizosphere soil increased, respectively, and the contents of oxalic acid, tartaric acid, succinic acid, malic acid, and lactic acid were increased by 18.36%~45.31%, 58.62%~503.22%, 15.71%~118.99%, 12.34%~123.27%, and 25.97%~36.05%, respectively, the activities of POD and GSH-PX were increased by 13.63%~34.82% and 9.70%~28.64%, respectively. The proportions of bioavailable uranium and cadmium in the rhizosphere soil were increased significantly. Moreover, the stable U(IV) in the root of Macleaya cordata was transformed to mobile U(VI), which could easily migrate from the underground part to the aboveground part of the plant, and the proportions of Acidobacteria and Ascomycota in the rhizosphere microbial community were increased, and they promoted Macleaya cordata's tolerance to and accumulation of uranium and cadmium mainly by improving enzyme activity.
胡南, 朱若南, 成浩, 谭国炽, 董雪, 张辉, 马建洪, 王永东, 丁德馨. 电场强化博落回修复铀镉复合污染土壤机理[J]. 中国环境科学, 2020, 40(10): 4457-4467.
HU Nan, ZHU Ruo-nan, CHENG Hao, TAN Guo-chi, DONG Xue, ZHANG Hui, MA Jian-hong, WANG Yong-dong, DING De-xin. Mechanism for electric field enhancing remediation of uranium and cadmium co-contaminated soil by Macleaya cordata. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4457-4467.
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