中文摘要：

我国土壤重金属污染问题已成为环境污染的热点问题。以柠檬酸和草酸作为萃取剂,采用态浸提的方式探讨萃取剂/土壤比例（酸土比）和萃取时间对土壤中Pb、Zn的去除效率和稳定效率的影响。研究结果显示：1）柠檬酸、草酸的最佳酸土比分别为10%和5%。2）柠檬酸和草酸通过改变重金属在土壤中的存在形态达到修复的目的。3）柠檬酸和草酸对Pb和Zn的静态浸取时间分别为10 d和5 d。柠檬酸和草酸对重金属Pb和Zn的静态浸取过程遵循改进后的一级反应动力学方程。

英文摘要：

In China,heavy metals contamination in soils has become a serious environmental issue. In this paper,oxalic acid and citric acid were used as extracting agents to extract lead（ Pb） and zinc（ Zn） from soils in a static way. The effects of extracting agent / soil weight ratio（ acid / soil ratio） and extraction time on removal rate and stabilization efficiency were studied. Results showed that： 1） The most suitable acid / soil ratio for oxalic acid and citric acid were 10% and 5%,respectively; 2） both oxalic acid and citric acid transformed the forms of Pb and Zn in soils to repair soil; 3） the best static extraction time for Pb and Zn by oxalic acid and citric acid was 10 d and 5 d,respectively. The static extraction kinetics of Pb and Zn by oxalic acid and citric acid fit well with the modified one-order reaction kinetics equation.