Pulse amperometric detection of salt concentrations by flow injection analysis using ionodes

A sensitive novel approach of using an amperometric ion detector for the no w injection analysis of salts has been developed. The detection methodology is based on measuring the-current associated with the transfer of ions acr oss polarized microinterfaces between the aqueous sample solution and a 2-n itrophenyloctyl ether-poly(vinyl chloride) gel phase, referred to as ionode s, Different sodium salts of fluoride, chloride, bromide, nitrate, and sulf ate were investigated. It was found that by employing an amperometric pulse detection mode and pure water as eluent; the detection limit of the ionode detector could be lowered to ppt level of salt concentrations under flowin g conditions.