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

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

Volume: 6 Issue: 2

Author(s): Abdollah Yari and Sedigheh Azizi

Affiliation:

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

Abstract: 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.

Cite this article as:

Yari Abdollah and Azizi Sedigheh, Development and Characterization of a New PVC-Membrane Electrode for Selective Sensing of K+ Ion, Current Analytical Chemistry 2010; 6 (2) . https://dx.doi.org/10.2174/157341110790945490