Effects of high concentration of chloride on the determination of trace anions by ion chromatography

Using both UV-Vis and conductivity detectors, the effects of high concentra tion of chloride on the determination of trace anions were studied on three different analytical columns by ion chromatography. The variations of rete ntion behavior of these anions were caused by self-elution effect and on-co lumn eluent change in the presence of high concentration of chloride. As th e chloride concentration increased, linear ranges of the other anions becam e narrow. The anions separated on the column, which had higher capacity and had wider linear ranges. When their peaks overlapped with chloride, the de viations of weak acid anions were caused by anion-proton interactions withi n the suppressor. However, the other weak acid anions, which could not over lap with chloride and the strong acids anions, were not affected. In this p aper, accurately quantitative analysis methods and their linear ranges were determined.