Coated-Graphite Ion-Selective Electrode for Na+ Ion and K+ Ion

Abstract

Coated-graphite ion-selective electrodes which are sensitive and reasonably selective for Na+ ion and K+ ion are developed and characterized. The electrode specific for sodium ion is based on the use of the antibiotic monensin as electroactive material employing o-n-octyloxynitrobenzene as a plasticizer in a polyvinyl chloride matrix. The one that is specific for potassium ion is based on the use of the antibiotic nigericin as a novel electroactive material employing o-n-octyloxynitrobenzene as a plasticizer in a polyvinyl chloride matrix. Selectivity coefficients, Nernstian response, linear range, detection limit and stability of electrode upon storage are characteristics studied. Preparation of the coated-graphite sensor is simple and rapid. Moreover, it is quite inexpensive. The results indicate that both monensin-based and nigericin-based coated-graphite ion selective electrodes, though not superb, could be of considerable value as analytical tools for the determination of Na+ and K+ ion, respectively, in some systems. A limitation is their applicability in aqueous media only, as organic solvents will dissolve the membrane

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