Highly selective thiocyanate poly(vinyl chloride) membrane electrode based on a cadmium-Schiff's base complex

A PVC membrane electrode based on a cadmium-salen (N,N'-bis-salicylidene-1,2-ethylenediamine) complex as an anion carrier is described. The electrode has an anti-Hofmeister selectivity sequence with a preference for thiocyanate at pH 1.5-11.0. It has a linear response to thiocyanate from 1.0 x...

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Published inFresenius' journal of analytical chemistry Vol. 370; no. 8; pp. 1091 - 1095
Main Authors MOHAMMAD REZA GANJALI, POURSABERI, Tahereh, BASIRIPOUR, Fatemeh, SALAVATI-NIASSARI, Masoud, YOUSEFI, Mohammad, SHAMSIPUR, Mojtaba
Format Journal Article
LanguageEnglish
Published Berlin Springer 01.08.2001
Subjects
Analytical chemistry
Chemistry
Exact sciences and technology
General, instrumentation
Schiff base
Membrane electrode
Response time
Detection limit
Thiocyanates
Selectivity
Polyvinyl chloride
Cadmium complex
Chemical sensor
Milk
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Summary:A PVC membrane electrode based on a cadmium-salen (N,N'-bis-salicylidene-1,2-ethylenediamine) complex as an anion carrier is described. The electrode has an anti-Hofmeister selectivity sequence with a preference for thiocyanate at pH 1.5-11.0. It has a linear response to thiocyanate from 1.0 x 10(-6) to 1.0 x 10(-1) mol L(-1) with a slope of 59.1 +/- 0.2 mV per decade, and a detection limit of 7 x 10(-7) mol L(-1). This electrode has high selectivity for thiocyanate relative to many common organic and inorganic anions. The proposed sensor has a fast response time of approximately 15 s. It was applied to the determination of thiocyanate in a milk sample.
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ISSN:0937-0633
1432-1130
DOI:10.1007/s002160100915