草酸联合东南景天修复镉污染土壤实验研究  

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

作　　者：郭凡嫡[1] 潘俊[2] 孙丽娜[3] 胡筱敏[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168 [3]沈阳大学区域污染环境生态修复教育部重点实验室,辽宁沈阳110044

出　　处：《东北大学学报（自然科学版）》2015年第7期1029-1032,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重点资助项目(21037002);国家重点基础研究发展计划项目(2104CB441100)

摘　　要：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.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 25 mmol / 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 25 mmol / 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.

关 键 词：镉污染 东南景天 矿山生态型 草酸 淋洗 

分 类 号：X53[环境科学与工程—环境工程]