Strip thick-film silver ion-selective electrodes

Miniaturized, planar silver ion-selective electrodes based on thick film of silver sulfide are described. The sensors were fabricated entirely by screen-printing, using low-temperature-curing polymer pastes and polyester substrate in form of flexible foils. Application of the thick-film technology results in highly reproducible and economic fabrication of the electrodes. These strip sensors exhibit analytical characteristics comparable with those for conventional ion-selective electrodes. The electrodes enable fast and reproducible potentiometric measurements with near-nernstian sensitivity. The sensors exhibit low detection limit and therefore, are useful as indicating electrodes in argentometric titrations as well as sensors for free silver ions in complexing media. The electrodes are also useful for determination of silver cations as well as halide anions under flow injection analysis regime.