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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (6): 532-536. 上一篇    下一篇

研究论文

Pb2＋在液/液界面迁移的电化学研究及其应用

陈恺，谢少艾，贾金平*   

  1. (上海交通大学环境科学与工程学院 上海 200240)
  • 投稿日期:2005-06-13 修回日期:2005-11-26 发布日期:2006-03-28
  • 通讯作者: 贾金平

Electrochemical Study and Application of Pb2＋ Transfer Across the Liquid/Liquid Interface

CHEN Kai, XIE Shao-Ai, JIA Jin-Ping*   

  1. (School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240)
  • Received:2005-06-13 Revised:2005-11-26 Published:2006-03-28
  • Contact: JIA Jin-Ping

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用循环伏安法研究了双硫腙络合推动Pb2＋在水/乙酰丙酮界面迁移的伏安过程. 实验证明, 该过程是受扩散控制的不可逆过程, Pb2＋由水相转移到有机相中, 与双硫腙形成络合物Pb(DzH)2. Pb2＋的峰电位在－0.3 V处, 并且在5× 10－6～0.1 mol•L－1范围内与峰电流成正比. 这一方法为工业废水中铅的在线、现场测定提供了可靠、灵敏的检测方法.

关键词: 液/液界面, 循环伏安法, 铅, 双硫腙

Pb2＋ has a sensitive complex peak in the water/acetylacetone-dithizone system. The voltammetric behavior of Pb(II) facilitated by dithizone (DzH2) across the water/acetylacetone interface was investigated by cyclic voltammetry. The process was controlled by diffusion and irreversible. Pb2＋ transferred from water to acetylacetone to form Pb(DzH)2 with dithizone. Pb2＋spike potential appeared at －0.3 V and the linear scope was 5×10－6～0.1 mol•L－1. The 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＋, dithizone