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Studies on the potentiometric thallium(III)-selective carbon paste electrode and its possible applications
K Vytras1, E Khaled, J Jezková
1Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Czech Republic.
Fresenius' Journal of Analytical Chemistry
|February 28, 2001
Abstract:
Construction, performance characteristics and applications of a carbon paste thallium(III) ion-selective electrode are described. The electrode, which is based on ion-associate compounds formed between cetylpyridinium and chlorothallate(III) complexes dissolved in tricresyl phosphate as pasting liquid, showed near-Nernstian response over the concentration range of 5.8 x 10(-6) - 2.9 x 10(-3) mol/L. Potentiometric titrations of thallium(III) with cetylpyridinium chloride were affected by higher concentrations of excess halides, probably due to the formation of higher halogenothallates.