双硫腙光极法测定废水中的痕量汞离子  

Spectrophotometric Determination of Trace Mercury Ion in Waste Water Using Bulk Optode Modified by Dithizone

作　　者：吕鉴泉[1] 周兴旺[1] 夏利君[1] 

机构地区：[1]武汉大学化学系

出　　处：《分析科学学报》2005年第1期13-16,共4页Journal of Analytical Science

基　　金：中国博士后基金(No.2002032211);湖北省教育厅科研基金(No.200220004)

摘　　要：本文用双硫腙为探针制备了PVC膜离子选择性光极,在优化膜组成和考察对常见金属离子响应的基础上,提出了一种测定痕量汞的光极方法。结果表明:光极膜组成为双硫腙∶PVC∶DOP∶KTpClPB(相对于双硫腙的mol%)=4∶60∶120∶50%时,对汞离子的响应最佳;在pH4.5的缓冲体系中,该光极对5×10-8～7×10-7mol/L的Hg2+有线性响应,检出限达4×10-8mol/L,只有Ag+、Pb2+有较小干扰,可用于水体中痕量汞的快速检出。A new bulk optode was prepared with PVC membrane based on dithizone. The new optode was optimized for the spectrophotometric determination of Hg^(2+) at 493 nm in the range 5×10^(-8) ～7×10^(-7)mol/L with a detection limit of 4×10^(-8 )mol/L.The sensor can readily be regenerated with the carrier, EDTA. The optode is fully reversible. The method was applied to the determination of mercury ion in waste water.

关 键 词：光极 双硫腙 识别 汞离子 

分 类 号：O657.15[理学—分析化学] O614.243[理学—化学]