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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (1): 79-83. 上一篇    下一篇

研究论文

液/液界面萃取循环伏安法测定Pb2+离子研究

谢少艾1，贾金平*,2，张卫1   

  1. (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)
  • 投稿日期:2007-04-28 修回日期:2007-08-08 发布日期:2008-01-14
  • 通讯作者: 谢少艾

The Study of Pb2+ Determination with Extracted and Cyclic Voltammetry at the Liquid/Liquid Interface

XIE Shao-Ai1 JIA Jin-Ping*,2 ZHANG Wei1   

  1. (1 School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240)
    (2 School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240)
  • Received:2007-04-28 Revised:2007-08-08 Published:2008-01-14
  • Contact: ShaoAi Xie

PDF

684

被引次数

6

本文利用吡咯烷二硫代氨基甲酸铵（APDC）作为螯合剂，甲基异丁酮（MIBK）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由扩散控制的不可逆过程，Pb2+的萃取物从有机相转移到水相。铅萃取物的转移峰在0.16V vs.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。

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

In this paper, the ammonium pyrrolidinyldithiocarboxylate(APDC)- methyl isobutyl ketone (MIBK) chelated-extract system was used. APDC chelated with Pb2＋ in solution, and then extracted into organic phase with MIBK. The cyclic voltammetric behavior of Pb-APDC complex at the liquid/liquid interfaces has been studied with classic three-electrode. The process was controlled by diffusion and irreversible, Pb2＋ complex transferred from organic phase to water. The transfer peak potential appeared at 0.16V vs.SCE, and the linear relative between 1.0×10－5mol/L～9.0×10-5mol/L and peak currents. Based on this, a reliable and sensitive method can be developed for the on-line and in-situ determination of Pb2＋ in industrial waste water.

Key words: liquid/liquid interface, cyclic voltammetry, Pb2＋ ion, methyl isobutyl ketone, ammonium pyrrolidinyldithiocarboxylate