Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250103, China; National-Local Joint Engineering Laboratory of Contaminated Soil Remediation By Bio-physicochemical Synergistic Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China.
Arizona State University, Tempe, AZ, 85281, USA.
Environ Res. 2021 Jul;198:111290. doi: 10.1016/j.envres.2021.111290. Epub 2021 May 7.
The influence of electrical fields on phytoremediation of multi-metal (Cd, Cu, and Zn) naturally contaminated soils has been investigated based on different soil sections. After ryegrass and hybrid penisetum were sowed for 30 d, electrical fields were applied during 30 days with the switching polarity every 30 min and continuing for 16 h d. After electrokinetic (EK) assisted phytoremediation process, soil electrical conductivity (EC) in anode section and available soil potassium (K) in cathode section were obviously elevated. Plants biomass in middle and cathode sections were increased in both plants, especially in middle section the overall biomass of hybrid penisetum increased by 68.8%. The influence of electrical field on the contents of heavy metals in plants was different depending on the species of plants, kind of heavy metals and soil section. For Cd, Cu, and Zn co-contaminated soils, shoot metals accumulation in middle section in both plants were improved at least about 20% (with the exception of Zn in ryegrass). Electrical fields had the most significant effect on copper absorption by ryegrass and shoot Cu accumulation were elevated 32.5% in all the section. The soil EC maybe an important factor that affected electrical fields enhanced plants growth, plant metals concentrations and remediation efficiency.
电场对多金属（Cd、Cu 和 Zn）自然污染土壤植物修复的影响基于不同的土壤部分进行了研究。在黑麦草和杂交狼尾草播种 30 天后，电场在 30 天内施加，每隔 30 分钟切换极性，并持续 16 小时。在电动（EK）辅助植物修复过程之后，阳极部分的土壤电导率（EC）和阴极部分的有效土壤钾（K）明显升高。两种植物的中、阴极部分的植物生物量增加，尤其是在中间部分，杂交狼尾草的整体生物量增加了 68.8%。电场对植物中重金属含量的影响因植物种类、重金属种类和土壤部分而异。对于 Cd、Cu 和 Zn 复合污染土壤，电场至少使两种植物中中间部分的地上部金属积累提高了约 20%（黑麦草中的 Zn 除外）。电场对黑麦草吸收铜的影响最大，所有部分的地上部 Cu 积累增加了 32.5%。土壤 EC 可能是影响电场增强植物生长、植物金属浓度和修复效率的重要因素。
