期刊
CHEMOSPHERE
卷 246, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.125666
关键词
Electric fields; Electrodes; Hyperaccumulator; Solanum nigrum L.; Cd contaminated soil
资金
- Special Plan in the Major Research & Development of the 13th Five-Year Plan of China [2018YFC1800501,2016YFD0800802]
- Natural Science Foundation of China [31870488, 41571300, 31270540, 31070455]
- Projects of Shaanxi Province of China [2019JM-413, 2018SZS-2707]
- project of Foreign Experts Bureau of Shaanxi province of China [GDT20186100430B, G20190241001]
Electrokinetics is a new attempt of strengthening hyperaccumulator Solanum nigrum L. Cd extraction. The effects of different electric fields and electrodes on S. nigrum accumulating Cd among of four electric field conditions (1 V cm(-1)) and two electrodes were determined. The results showed that the AC electric field significantly stimulated (p < 0.05) the growth of S. nigrum, and the biomass increased nearly by 40% compared with the control, while the DC electric field (including the switching polarity) had no significant effect. Electric field significantly increased (p < 0.05) Cd concentration in S. nigrum and the highest one was recorded for the DC electric field with switching polarity. S. nigrum Cd accumulation (ug pot(-1)) was the highest under the AC electric field, which was nearly 70% higher compared to the control. The innovation found was that the role of biomass enhancement for S. nigrum accumulating Cd (ug pot(-1)) was the first and increased Cd concentration was secondary under AC electrical field, which might be relative with S. nigrum is a weed species. Basically, there was no significant difference between the graphite and stainless steel electrode, but under AC electric field conditions, Cd accumulation of S. nigrum was significantly higher (p < 0.05) than stainless steel electrode, which is worthy of further revelation besides of statistic factor. In general, the accumulation (ug pot(-1)) of Cd by S. nigrum was the highest under the AC electric field, which was a very important reference for the electrokinetic conditions to be used in the practice of phytoremediation. (C) 2019 Elsevier Ltd. All rights reserved.
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