POTENTIOMETRIC DETECTION IN ION CHROMATOGRAPHY USING MULTI-IONOPHORE MEMBRANE ELECTRODES

The incorporation of ionophores selective for ammonium, potassium, sod ium and calcium ions in an appropriate proportion into a plasticized p oly(vinyl chloride) membrane provides a potentiometric membrane sensor with similar sensitivity to ammonium, alkali and alkaline earth metal ions. Such a sensor was employed in single-column ion chromatography using the wall-jet flow-cell arrangement, and was shown to exhibit sim ilar detectability to that observed for conductivity detection.