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.
出处
《分析科学学报》
CAS
CSCD
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)
关键词
光极
双硫腙
识别
汞离子
Optode
Dithizone
Analysis
Mercury ions
