A mercury(II) ion-selective electrode based on neutral salicylaldehyde thiosemicarbazone

被引：148

作者：

Mahajan, RK ^{[1
]}

Kaur, I ^{[1
]}

Lobana, TS ^{[1
]}

机构：

[1] Guru Nanak Dev Univ, Dept Chem, Amritsar 143005, Punjab, India

来源：

TALANTA | 2003年 / 59卷 / 01期

关键词：

sensor; mercury(II); potentiometry; thiosemicarbazone;

D O I：

10.1016/S0039-9140(02)00473-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new ion-selective PVC membrane electrode based on salicylaldehyde thiosemicarbazone as an ionophore is developed successfully as sensor for mercury(II) ions. The electrode shows excellent potentiometric response characteristics and displays a linear log[Hg2+] versus EMF response over a wide concentration range of 1.778 x 10(-6)-1.0 x 10(-1) M with Nernstian slope of 29 mV per decade with the detection limit of 1.0 x 10(-6) M. The response time of the electrode is less than 30 s and the membrane electrode operates well in the pH range of 1.0-3.0. The lifetime of the sensor is about 2 months. The electrode shows better selectivity towards Hg2+ ions in comparison with the alkali, alkaline and some heavy metal ions; most of these metal ions do not show significant interference (K-Hg,M(Pot) values of the order of 10(-3)-10(-4)). The present sensor showed comparable or even better performance vis-A-vis similar PVC based ion-selective electrodes reported-in literature. The sensor was also applied as an indicator electrode for potentiometric titration of Hg2+ ions with I- and Cr2O72-. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：101 / 105

页数：5

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