POTENTIOMETRIC DETECTION OF ANIONS SEPARATED BY LIQUID-CHROMATOGRAPHYUSING A METALLIC SILVER WIRE ELECTRODE

A silver metallic wire electrode, coated with AgCl, used for potentiom etric detection of inorganic anions in liquid chromatography, is descr ibed. The electrode response to the anions was evaluated by both stati c and flow injection measurements, and results have shown that the ele ctrode exhibits sensitive response to Cl- and SCN- with a detection li mit of 10(-6) M. The electrode was used as a potentiometric detector f or the determination of anions following separation by ion chromatogra phy using the eluent containing 5 mM phthalate at pH 4.2. Calibration plots were not Linear, but give a useful working range of 5 x 10(-5) t o 3 x 10(-2) M. It also demonstrated to be a useful detector for the d etection of anions separated, where the separation of anions Was prefo rmed with a C-18 column using a 0.1 mM octylammonium salicylate as an ion-paring reagent, by ion-pair chromatography. The determination of c hloride in waste water samples were demonstrated by proposed method.