Journal
TALANTA
Volume 52, Issue 2, Pages 319-328Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-9140(00)00363-5
Keywords
potentiometric sensor; polypyrrole-calcion film; indicator electrode; titration
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This paper shows the application of conducting polymers (CPs) for constructing potentiometric indicator electrodes. Two types of polypyrrole (PPy)-based calcium sensors are presented, one sensor with PPy-calcion him as the active part and the other sensor with PPy-calcion as a solid-state contact coated with a conventional membrane selective towards calcium ions. It is shown that the PPy-calcion film, due to the complexing properties of calcion ensuring high loading of the film with calcium, is sufficiently selective to be used as the active part or as a mediating layer of the indicator electrode. The electrode, with PPy-calcion film as the active part, was used as the indicator electrode in potentiometric titrations of calcium in mixed solvents, where conventional PVC-based electrode can not be used. For the first time, the practical applicability of PPy-based electrodes in titrations is demonstrated. (C) 2000 Elsevier Science B.V. AII rights reserved.
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