Photocured polymers in ion-selective electrode membranes. Part 5: Photopolymerised sodium sensitive ion-selective electrodes for flow injection potentiometry

A photocured sodium ion-selective electrode, based on the ionophore N,N′-dibenzyl-N,N′-diphenyl-1,2-phenylenedi-oxydiacetamide (ETH 157), was developed and evaluated. The robust nature of the photocured membrane made it ideally suited for measurements in flow injection potentiometry. The detection limit was 4 × 10−5M. The electrode was used successfully to determine sodium levels in a range of drinking water and environmental water samples.