The focusing phenomenon is a difficult point during the electrokinetic remediation (EKR) of contaminated soil. It restricts the extraction and removal of heavy metals. There is still a lack of methods to discern focusing position rapidly and take proper measures. Therefore, a total of seven tests with or without intervening and regulating measures were conducted. Among the four tests without regulating and intervening measures, focusing position often appeared in low-voltage region after three days’ treatment. When using ammonium citrate as electrolyte, the highest removal efficiency of total chromium (Cr) (32.20%) was achieved. The intervening measure that adding citric acid near section 4 decreased the area of high-voltage and made it move towards cathode. Meanwhile, the removal efficiency of Cr(VI) (60.17%) was significantly improved. Using sodium dodecyl sulfate (SDS) as pretreatment agent and electrolyte made the position of high-voltage area move towards anode and removed 35.80% of total Cr and 53.47% of Cr(VI) eventually. Simultaneously, the energy consumption per gram of removed Cr was also the lowest. The focusing degree was reduced with intervening and regulating measures conducted but focusing position still existed in low voltage area, which further indicated that focusing position preferred to appear in low voltage area and we could discern focusing position through voltage distribution across the soil roughly.

聚焦现象是污染土壤的电动修复（EKR）过程中的难点。它限制了重金属的提取和去除。仍然缺乏快速识别聚焦位置并采取适当措施的方法。因此，总共进行了七个有或没有干预和调节措施的测试。在没有调节和干预措施的四项测试中，经过三天的治疗，聚焦位置经常出现在低压区域。当使用柠檬酸铵作为电解质时，总铬（Cr）的去除效率最高（32.20％）。在第4部分附近添加柠檬酸的干预措施减小了高压区域并使之移向阴极。同时，Cr（VI）的去除效率（60.17％）显着提高。使用十二烷基硫酸钠（SDS）作为预处理剂和电解质，使高压区域的位置移向阳极，最终除去了总铬的35.80％和六价铬（VI）的53.47％。同时，每克去除的Cr的能量消耗也最低。通过采取干预和调节措施降低了聚焦度，但在低压区域仍存在聚焦位置，这进一步表明聚焦位置倾向于出现在低压区域，并且我们可以通过土壤上的电压分布粗略地辨别聚焦位置。每克去除铬的能耗也最低。通过采取干预和调节措施降低了聚焦度，但在低压区域仍存在聚焦位置，这进一步表明聚焦位置倾向于出现在低压区域，并且我们可以通过土壤上的电压分布粗略地辨别聚焦位置。每克去除铬的能耗也最低。通过采取干预和调节措施降低了聚焦度，但在低压区域仍存在聚焦位置，这进一步表明聚焦位置倾向于出现在低压区域，并且我们可以通过土壤上的电压分布粗略地辨别聚焦位置。