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Experimental procedures for the determination of amperometric selectivity coefficients

✍ Scribed by Carlo Maccà; Joseph Wang

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
861 KB
Volume
303
Category
Article
ISSN
0003-2670

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✦ Synopsis

Procedures for the determination of amperometric selectivity coefficients, expressing the extent of interference of foreign electroactive substances on the amperometric sensing of the target analyte, are critically assessed. Separate solution (equiconcentration, matched current, measurement matching sample composition, separate calibration) and mixed solution methods (fixed analyte and fixed interferent, with single or multiple addition, alternate analyte and interferent addition) are examined. The performance of different methods and procedures with a model system (catechol and ferrocyanide) and a system with direct interaction between the electroactive species (dopamine and ascorbic acid) is experimentally explored. The advantages of mixed solution methods are discussed.

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