中文摘要：

为研究电动力学作用对污染土壤中HCHs迁移的影响及不同HCHs异构体间的迁移特征,以我国西南地区已停产的某HCHs（六六六）生产企业厂区的污染土壤为研究对象,分析反应时间、电压梯度、w（电解质）和p H等因素对HCHs迁移效果的影响.结果表明：HCHs可以在电场力条件下进行有效迁移,其迁移效果随反应时间的增加而增强,并在192 h后达到稳定;增加电压梯度可以促进HCHs的迁移,最佳电压梯度为3.0 V/cm;最佳w（电解质）为2%;HCHs的迁移效果在p H为5.07时达到最佳.HCHs由阴极向阳极迁移,不同HCHs异构体在阳极的富集程度存在差异,其中α-HCH富集率最高,为210.5%~226.3%;而β-HCH、γ-HCH、δ-HCH富集率分别为72.5%~265.3%、38.5%~79.3%、57.3%~62.6%.电动试验结束后,阴极处电导率最高,为1.2~324.4 m S/cm.P（0.6）（距阴极的标准化距离为0.6的采样点）处最低,为0.1~70.1 m S/cm;土壤p H由阴极向阳极逐渐减小,其中阴极p H为10.31~12.05,而阳极p H为0.98~4.56.研究显示,电动因素会对污染土壤中HCHs的迁移造成不同程度影响;不同HCHs异构体中,α-HCH迁移能力最强,β-HCH次之,γ-HCH和δ-HCH迁移能力较弱.

英文摘要：

To investigate the influencing factors and migration characteristics of HCHs with different isomers in contaminated soils under electrokinetics,samples collected from a suspended HCHs manufacturer in southwest China were employed to conduct experiments.Electrokinetic factors,including reaction time,voltage gradient,electrolyte content（ w） and p H value,were taken into account for the HCHs migration investigation. The results indicate that effective migration of the HCHs could be achieved by the electrokinetic process.First,the increase of reaction time could enhance the migration effect towards a stable status at 192 h. Second,the migration of the HCHs was improved by raising the voltage gradient,with optimum value of 3. 0 V/cm. Third,the optimum w was 2%. Finally,the best migration effect for the HCHs was correlated to p H 5. 07 in the experiments. As the migration was from cathode to anode,different HCHs isomers exhibited different accumulation performances at the anode. The best accumulation rates from 210. 5%-226. 3% were tested for α-HCH,followed by 72. 5%-265. 3%,38. 5%-79. 3% and 57. 3%-62. 6% for β-HCH,γ-HCH and δ-HCH,respectively. After the electrokinetic processes,the cathode displayed the highest electrical conductivity 1. 2-324. 4 m S/cm,while P（ 0. 6）（ the normalized distance from cathode was 0. 6） had the lowest one（ 0. 1-70. 1 m S/cm）. It was also found that the p H value of the soil decreased from the cathode（ 10. 31-12. 05） to the anode（ 0. 98-4. 56）. In conclusion,electrokinetic factors play important roles in the migration of HCHs. Among different HCHs isomers,the best migration capability was found in α-HCH,followed by β-HCH,γ-HCH and δ-HCH.