Potentiometric Determination of Potassium Using an Indigenously Fabricated Coated Wire Ion Selective Electrode
A potentiometric sensor system based on coated wire has been developed indigenously for selectivity towards potassium ion. The electrode has been prepared by coating a silver wire conductor with PVC based film. The preferred system with an antibiotic Valinomycin in membrane shows a linear response towards potassium ions over a concentration range of 1x 10-1 M to 1x 10-5M of KCl solution. A saturated calomel electrode was used as a reference electrode with LiCl3Ac as an internal filling solution. To avoid interferences, KCl was not used. The electrode was also tried for the determination of potassium ion in KCl tablets NEO-K, supplied by Zaffa, Pvt. Ltd. Pakistan. Reported value of potassium in tablets was 260mg/tablet and result found with coated wire electrode was 265 mg / tablet.
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