Potentiometric Utility of the New Solid-State Sensor Based on Crowned Ionophore for the Determination of K~+

摘要

All solid-state contact poly vinyl chloride(PVC)membrane potassium-selective electrode has been developed.The construction of the ion selective electrode membrane was organized using ionophore 4,4-bis[4-phenoxy(15-crown-5)methyl]benzyl in PVC cocktail.The potentiometric performance characteristics of the electrode were investigated by a computerized system.The electrode was found highly selective to K~+ions over a wide variety of other cations.The electrode almost exhibited a Nernstian response(>=55(±15)mV/decade of K activity)to K~+within the concentration range 1.5 X 10~(-1)-1.0X 10~(-5)M.The operational pH range of the electrode was 5-7.The response time of the electrode was fast(<10 s),and the life time was long(at least 2 months).The electrode has been successfully used in real sample analysis.The values obtained by the electrode were in good agreement with the certified values.