柠檬酸、草酸对污染土壤中铅锌的静态浸提实验研究  

REMEDIATION OF HEAVY METALS( Pb,Zn) CONTAMINATED SOIL WITH CITRIC ACID AND OXALIC ACID

作　　者：向玥皎[1] 刘阳生[1] 

机构地区：[1]北京大学环境科学与工程学院固体废物资源化技术与管理北京市重点实验室,北京100871

出　　处：《环境工程》2015年第9期153-157,30,共6页Environmental Engineering

基　　金：国家自然科学基金(21077002)

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。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.

关 键 词：土壤 重金属 修复 草酸 柠檬酸 

分 类 号：X53[环境科学与工程—环境工程]