草酸联合东南景天修复镉污染土壤实验研究

为了解草酸淋洗联合东南景天修复镉污染土壤的效果,选取矿山生态型东南景天根系分泌物中的草酸作为淋洗剂,联合矿山生态型东南景天进行镉污染土壤修复的实验.通过4种浓度的草酸分别对土壤进行了4次淋洗后,可以看出草酸浓度达到25 mmol/L时,东南景天干重最大,地上部镉含量最多,总去除量最大,去除效率可以达到51.34%,与不淋洗组对比高35个百分点.实验表明草酸浓度在25 mmol/L时联合东南景天修复镉污染土壤的效果达到最佳.实验证明使用草酸淋洗联合矿山型东南景天修复镉污染土壤,镉的去除效果比较显著,且生态型东南景天生长健康,从而为草酸联合东南景天修复镉污染技术的推广和应用提供了科学依据.

Experimental Research on Restoring Cadmium-Contaminated Soil by Using Oxalic Acid Combined with Sedum Alfredii Hance

For studying the effect of restoring cadmium-contaminated soil by using oxalic acid elution combined with Sedum alfredii hance, a test was performed by using Sedum alfredii hance combined with oxalic acid chosen from the roots secretion of mine ecological Sedum alfredii hance as an eluent. After four times of soil elution tests were doned by using four different concentration oxalic acid solutions, it was shown that when the concentration of oxalic acid was 25mmol/L, the maximum dry weight of Sedum alfredii hance and the most abundant cadmium on the ground were obtained. The total mass removal rate was the biggest, which could arrive at 51.34%, and it was higher than the group of no elution for 35 percent points. The test results showed that the effect of restoring cadmium-contaminated soil was the best when using the 25mmol/L concentration oxalic acid combined with Sedum alfredii hance. This test results can prove that the oxalic acid combined with mine ecological Sedum alfredii hance has a significant effect in the cadmium removal to restore cadmium-contaminated soil, and the ecotype Sedum alfredii hance grows healthy as well. Scientific proof is provided for the promotion and application of the restoring technology of cadmium-contaminated soil by using oxalic acid combined with Sedum alfredii hance.