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Electrokinetic-assisted phytoremediation of atrazine: Differences between electrode and interelectrode soil sections
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2018-09-21 , DOI: 10.1016/j.seppur.2018.09.064
Virtudes Sánchez , Francisco Javier López-Bellido , Manuel Andrés Rodrigo , Luis Rodríguez

Electrokinetic-assisted phytoremediation (EKPR) has been recently proposed by us to remediate soils contaminated by atrazine, a common pesticide in agrarian areas. The goal of this work was to study the differences of electrochemical and biological processes occurred in the different soil sections (anode, cathode and interelectrode section) of the pots used in an EKPR test carried out with maize and a low permeability soil spiked with atrazine. An initial atrazine soil concentration of 5 mg kg−1 was used; the electric current (with voltage gradients of 2 and 4 V cm−1) was applied during 14 days, 4 h a day and changing the polarity of the electrodes each 2 h. This operation mode avoided the extreme soil pH values, although it tended to increase throughout the EKPR test causing soil alkalinisation, especially in the cathode. As a result, maize growth was poorer in the electrode soil sections. Atrazine and its metabolites, deethylatrazine and deisopropylatrazine, were taken up and accumulated in the maize tissues in a different extent depending on the soil section considered, showing the mobilization of atrazine by the electric current. The best results were found for the 2 V cm−1 treatment, for which the presence of maize increased 20–30% the overall atrazine removal in the cathode and middle sections of the planted pots as compared to the unplanted pots, showing the ability of EKPR to improve the efficiency of the electrokinetic remediation. Electromigration and electroosmotic flux contributed to transport atrazine and its metabolites throughout the soil.



中文翻译:

电动辅助对r去津的植物修复作用:电极和电极间土壤截面之间的差异

我们最近提出了电动辅助植物修复(EKPR),以修复被农业地区常见农药阿特拉津污染的土壤。这项工作的目的是研究在用玉米进行的EKPR试验中使用的花盆的不同土壤部分(阳极,阴极和电极间部分)发生的电化学和生物过程的差异,该土壤在玉米和掺入r去津的低渗透性土壤中进行。初始at去津土壤浓度为5 mg kg -1;电流(电压梯度为2和4 V cm -1)在14天,4公顷的一天中施加),每2个小时更换一次电极的极性。此操作模式避免了极端的土壤pH值,尽管在整个EKPR测试中它倾向于增加,导致土壤碱化,尤其是在阴极。结果,电极土壤部分的玉米生长较差。取决于所考虑的土壤剖面,r去津及其代谢产物去乙基去津和去异丙基去津在玉米组织中的吸收和积累程度不同,显示了电流对去r津的动员。对于2 V cm -1发现最佳结果处理后,与未种植的盆相比,玉米的存在增加了种植盆的阴极和中间部分中总at去津的20-30%,这表明EKPR能够提高电动修复效率。电迁移和电渗通量有助于阿特拉津及其代谢产物在整个土壤中的运输。

更新日期:2018-09-21
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