电动修复技术对土壤中镉迁移的影响

以镉含量为200 mg·kg-1的模拟污染土壤为研究对象，使用电动修复技术对土壤中的镉进行去除。实验研究了不同修复电压下电流密度、电解液pH值、土壤中镉含量的变化，并重点研究了修复电压对土壤中镉迁移的影响规律。实验结果表明，通电电压越大，电场强度越强，镉的迁移量越大，电动修复效率越高，当修复电压为50 V时，阴极区域附近镉的迁移量与修复电压为5 V时相同位置镉的迁移量相比可以提高30%，实验结果为重金属污染土壤电动修复过程中镉的迁移量化研究提供了参考。

Effect of cadmium migration in contaminated soil by electrokinetics remediation

Simulated contaminated soil containing 200 mg·kg-1 cadmium was employed to study the removal of cadmium in soil by electrokinetic remediation.The effects of current density,pH value of the electrolytes,and the cadmium content of the soil were investigated under different voltage gradients,and the effects of electrokinetic remediation voltages on migration regularities of Cd in soil were the primary focus.The results showed that a high voltage,strong electric field intensity,and large migration of cadmium contribute to high electrokinetic remediation efficiency.With respect to that at 5 V,30% more cadmium migrated into the cathode region at an electrokinetic remediation voltage of 50 V.These experiments provided quantitative results for heavy-metal migration in cadmium-contaminated soil during electrokinetic remediation.