We have attempted to obtain optimal conditions of direct current electrical field with switching polarity to increase Cd accumulation of the hyperaccumulator Solanum nigrum L. from soil. The effects of different voltages and treatment times on S. nigrum accumulating Cd were determined. The results showed that Cd concentration in S. nigrum under all electrical field conditions were significantly higher (p < 0.05) than that of the CK. The Cd concentration in shoot and root of treatment T3 (3 V cm-1) were higher than the equal results of treatment T2 (2 V cm-1) and T1 (1 V cm-1) under the same condition of 6 h d-1 treatment time. In different treatments concerning time of T1 (6 h d-1), T4 (10 h d-1) and T5 (14 h d-1) under same voltage of 1 V cm-1, the S. nigrum Cd concentration were with similar trend to the different voltage treatments (T5 with the highest Cd concentration). These results might be caused by positive change trends of pH, EC and extractable Cd concentration in soil. However, the S. nigrum biomasses of T3 were the lowest and the highest biomass happened in treatment of T4. Finally, the highest Cd accumulation in S. nigrm (μg pot-1) was the T4 with the condition of 1 V cm-1 and 10 h d-1, which was also the optimal voltage and treatment time of the electric field. The optimal conditions were important references in the practice of combined use of electrokinetic remediation and phytoremediation.

中文翻译：

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土壤中镉过度积累对茄的辅助电压的最佳电场处理时间。

我们试图获得具有切换极性的直流电场的最佳条件，以增加土壤中超级蓄积植物茄的Cd积累。确定了不同电压和处理时间对黑曲霉累积镉的影响。结果表明，在所有电场条件下，黑链霉菌中的Cd浓度均显着高于CK（p <0.05）。在相同的6 h d条件下，处理T3（3 V cm-1）的芽和根中Cd浓度高于处理T2（2 V cm-1）和T1（1 V cm-1）的相等结果。 -1治疗时间。在相同的1 V cm-1电压下，关于T1（6 h d-1），T4（10 h d-1）和T5（14 h d-1）的时间的不同处理中，S。黑碳Cd浓度的趋势与不同的电压处理（T5的Cd浓度最高）相似。这些结果可能是由于土壤中pH，EC和可萃取Cd浓度的正变化趋势所致。然而，T3的黑链霉菌生物量最低，最高。最后，S。nigrm（μgpot-1）中最高的Cd累积量是T4，条件是1 V cm-1和10 h d-1，这也是电场的最佳电压和处理时间。最佳条件是电动修复和植物修复相结合的实践中的重要参考。T3处理的黑生物量最低，最高。最后，S。nigrm（μgpot-1）中最高的Cd积累量是T4，条件是1 V cm-1和10 h d-1，这也是电场的最佳电压和处理时间。最佳条件是电动修复和植物修复相结合的实践中的重要参考。T3处理的黑褐菌生物量最低，最高。最后，S。nigrm（μgpot-1）中最高的Cd积累量是T4，条件是1 V cm-1和10 h d-1，这也是电场的最佳电压和处理时间。最佳条件是电动修复和植物修复相结合的实践中的重要参考。