重庆市菜地土壤镉污染的原位表层淋洗-深层固化修复研究

In-Situ Remediation of Cadmium-Contaminated Soil of Vegetable Base by Leaching-immobilization in Chongqing

采用田间原位试验,研究了表层淋洗-深层固化技术对重庆市菜地土壤与蔬菜镉污染的修复效果.结果表明,酒石酸淋洗-硫化钠固化组合对蔬菜降Cd率为48.50%,对表层土壤中Cd的削减率为31.69%,对深层土壤中Cd的固化率为20.16%.而EDTA淋洗降低了蔬菜产量,不宜推荐.本技术在不影响正常生产活动的同时,降低了蔬菜中的重金属质量分数,既能保证蔬菜的安全性,又能够尽量减少菜农经济损失,是一种适合于轻中度土壤重金属污染的修复技术.

A field experiment has been conducted in-situ investigation of the restoration effect of surface leaching-deep immobilization technology of Chongqing vegetable soil and vegetables of cadmium and lead.The results show that the tartaric acid leaching-sodium sulfide cured by the combination of Cd in vegetable reduction rate was 48.50%,of Cd in the surface soil reduction rate were 31.69%,rate of Cd in the deep soil immobilization 20.16%,respectively.EDTA reduced the leaching yield of vegetables,not recommended.This technology can not only affect the normal production activities,but also reduce the heavy metal content in vegetables,which can not only ensure the safety of vegetables,but also can reduce the economic losses of farmers.It is an effective remediation technology of heavy metal pollution in soil.