Fabrication of Potassium Ion-selective Membrane Electrode as Immobilized Liquid based on Dibenzo-18- Crown-6 (DB18C6) as Ionophore

Precisely detection of specific ion in a solution with ion electrodes providesvaluable clinical and chemical information. for this purpose, specific ion selective electrodeshave been designed, which are able to detect the concentrations of specific ions as much as10-5 m. in this study, we introduced a polyvinylchloride (pvc)–based membrane of dibenzo-18-crown-6 (db18c6), which exhibited good potentiometric response for k+ over a wideconcentration range of 1.0×10-5 to 1.0×10-2 mol l-1. the best nernstian slope for the desiredelectrode was 53 mv/decade of k+ concentration. matched potential method (mpm) wasused for determination of selectivity coefficient. the response time for the k+ selectiveelectrode was 30 s. the electrode was used for a period of 4 weeks. our results showed thatthe electrode can be used in wide ph range from 3.0 to 9.5. electrode was successfullyapplied for determination of potassium in oral rehydration salts (ors) and mineral water