DETERMINATION OF BROMIDE IN SNOW SAMPLES BY ION CHROMATOGRAPHY WITH ELECTROCHEMICAL DETECTION

Ion chromatography with electrochemical detection was applied to the d etermination of bromide in snow samples. Greater reproducibility and i ncreased sensitivity was obtained by coating the silver electrode with a highly insoluble AgI surface. Without preconcentration, a detection limit of less than 1 mug l-1 was achieved. With preconcentration, sno w samples from a high-alpine site with bromide concentrations as low a s 90 ng l-1 could be analysed.