Novel Potentiometric Membrane Sensor for the Determination of Trace Amounts of Chromium(III) Ions

被引：0
|
作者：
Mohammad Reza Ganjali
Farhang Mizani
Masoud Salavati-Niasari
Mehran Javanbakht
机构：
[1] Tehran University,Department of Chemistry, Faculty of Science
[2] Kashan University,Department of Chemistry, Faculty of Science
[3] Tarbiat Modarres University,Department of Chemistry, Faculty of Science
来源：
Analytical Sciences | 2003年 / 19卷 / 2期
关键词：
D O I：
10.2116/analsci.19.235
中图分类号：
学科分类号：
摘要：
A plasticized Cr3+ ion sensor by incorporating 2,3,8,9-tetraphenyl-1,4,7,10-tetraazacyclododeca-1,3,7,9-tetraene (TTCT) ionophore exhibits a good potentiometric response for Cr3+ over a wide concentration range (1.0 × 10-6 - 1.0 × 10-1 M) with a slope of 19.5 mV per decade. The sensor response is stable for at least three months. Good selectivity for Cr3+ in comparison with alkali, alkaline earth, transition and heavy metal ions, and minimal interference are caused by Li+, Na+, K+, Co2+, Hg2+, Ca2+, Pb2+ and Zn2+ ions, which are known to interfere with other chromium membrane sensors. The TTCT-based electrode shows a fast response time (15 s), and can be used in aqueous solutions of pH 3 - 5.5. The proposed sensor was used for the potentiometric titration of Cr3+ with EDTA and for a direct potentiometric determination of Cr3+ content in environmental samples.
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页码：235 / 238
页数：3
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