液／液界面萃取循环伏安法测定Pb^2＋离子  

Pb^(2+) Determination with Extraction and Cyclic Voltammetry at the Liquid/Liquid Interface

作　　者：谢少艾[1] 贾金平[2] 张卫[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]上海交通大学环境科学与工程学院,上海200240

出　　处：《化学学报》2008年第1期79-83,共5页Acta Chimica Sinica

基　　金：国家863(No.2006AA06Z405)资助项目

摘　　要：利用吡咯烷二硫代氨基甲酸铵作为螯合剂,甲基异丁酮作为萃取剂,将水相中的Pb2+萃取到有机相中,利用经典的三电极系统研究该有机相在液/液界面的伏安特性.实验结果表明,该电化学过程是一个不可逆过程,Pb2+的萃取物从有机相转移到水相.铅萃取物的转移峰在0.16Vvs.SCE处,并且在1.0×10-5～9.0×10-5mol/L范围内与峰电流大小成正比.这一方法为工业废水中铅的在线、现场测定提供了可靠、灵敏的监测方法.The ammonium pyrrolidinyldithiocarboxylate （APDC） was used as a chelate reagent, and then the pb^2＋-APDC complex was extracted by methyl isobutyl ketone from an aqueous phase to an organic phase. The cyclic voltammetric behavior of the organic phase at the liquid/liquid interface has been studied with a classic three-electrode system. The results indicated that the transfer process of Pb^2＋-APDC complex from the organic phase to the aqueous phase was irreversible. The transferring peak of Pb^2＋ extractant appeared at 0.16 V vs. SCE, and was linearly proportional to the peak current between 1.0 ×10^-5～9.0×10^-5 mol/L. Based on this, a reliable and sensitive method can be developed for the on-line and in-situ determination of Pb^2＋ in industrial waste water.

关 键 词：液 /液界面 循环伏安 铅离子 甲基异丁酮 吡咯烷二硫代氨基甲酸铵 

分 类 号：O657.1[理学—分析化学] X172[理学—化学]