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Updated: Dec 31, 2025

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Published on: September 1, 2020
The effects of different electric fields and electrodes on Solanum nigrum L. Cd hyperaccumulation in soil
Lei Xu1, Huiping Dai2, Lidia Skuza3
1Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100039, China.
Abstract:
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.
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