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Current Analytical Chemistry


ISSN (Print): 1573-4110
ISSN (Online): 1875-6727

Development and Characterization of a New PVC-Membrane Electrode for Selective Sensing of K+ Ion

Author(s): Abdollah Yari and Sedigheh Azizi

Volume 6, Issue 2, 2010

Page: [166 - 171] Pages: 6

DOI: 10.2174/157341110790945490

Price: $65


This paper describes a potassium ion-selective electrode based on 2,2-dithiodibenzoic acid with a focus on the sub-Nernstian response characteristics. The topics including the experimental parameters that influence the response of the electrode, useful membrane compositions and applications were investigated. The membrane electrode demonstrate linear (R2= 0.999) sub-Nernstian responses, with the slop of 40.12 ± 0.15 mV/decade, toward potassium(I) ions over the range of 1.0 x 10– 5 to 1.0 M. The prepared electrode, with detection limit of 6.2 x 10-6 M, was successfully applied in the direct potentiometric measurement of sub-milimolar quantities of K+ in aqueous solutions. The results were compared with atomic absorption spectrometry measurements. There was good agreement between the results from the proposed electrode and those from the standard method.

Keywords: 2,2'-Dithiodibenzoic acid, Potassium-selective electrode, Potentiometry, PVC-membrane

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