STABILITY OF BROMATE SPECIES IMMOBILIZED ON MICROCOLUMNS OF ACTIVATEDALUMINA

Microcolumns of activated alumina (n = 30) were charged with bromate s tandard solution (0.5 mi, 6.0 mu g l(-1)) and stored at 4 degrees C in a light-tight container. Microcolumns were removed at regular time in tervals (1 h, 2 and 3 d and 1, 2, 3, 4 and 8 weeks) and bromate specie s were eluted and quantified by flow-injection ICP-MS, Analyte recover ies were found to be quantitative (96-101%) and reproducible over the 8 week period, These results indicate that for trace level determinati ons (mu g l(-1)) of bromate, a microcolumn format may provide a conven ient and reliable route for delivery of external calibrants and refere nce materials.