几种萃取剂对土壤中重金属生物有效部分的萃取效果  

Comparing several extractants for extracting bioavailable part of heavy metals in soils

作　　者：刘玉荣[1] 党志[2] 尚爱安[3] 文震[2] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002 [2]华南理工大学化工学院,广东广州510641 [3]华东理工大学环境工程系,上海200237

出　　处：《土壤与环境》2002年第3期245-247,共3页Soil and Environmental Sciences

基　　金：国家自然科学基金(49873033);广东省环保局项目(2001-27)

摘　　要：采用6种萃取剂:pH=7的0.01mol/L CaCl_2、pH=7.3的0.005mol/L DTPA+0.1mol/L TEA(三乙醇胺)+0.01mol/L CaCl_2O.1mol/L NaNO_3、0.43mol/L HOAc、pH=7的0.05mol/L EDTA和pH=4.65的0.5mol/L NH_4OAc+0.02mol/L EDTA浸取液.对污染土壤中的重金属Cu、Zn、Cd、Pb、的进行了萃取,并比较了萃取剂的萃取能力。实验结果表明,HOAc、EDTA以及NH_4OAc-EDTA萃取各种重金属的能力远远大于其它几种萃取剂的萃取能力,是比较理想的萃取剂。Heavy metals were extracted with six selected solutions and the extraction results were compared .The six solutions were : 0.01 mol/L CaCl2 (pH=7), 0.005 mol/L DTPA+0.1 mol/L TEA+0.01 mol/L CaCl2(pH=7.3), 0.1 mol/L NaNO3, 0.43 mol/L HOAc, pH=7 0.05 mol/L EDTA( pH=7) and 0.5 mol/L NH4OAc+0.02 mol/L EDTA( pH=4.65). It was showed that the extraction results of HOAc, EDTA and NH4OAc-EDTA were much better than other extractants, and they were suitable to extract the bio-effective parts of heavy metals in soils .

关 键 词：萃取剂 土壤 重金属 化学萃取法 生物有效性 土壤污染 

分 类 号：X53[环境科学与工程—环境工程]