DETERMINATION OF NITRITE AND BROMATE IN DISINFECTED WATER SAMPLES AT THE LOW MU-G L LEVEL BY MEANS OF A HIGH-CAPACITY ANION-EXCHANGER/

Bromate and nitrite are formed during the disinfection of water. The G erman threshold value for nitrite in drinking water is 100 mu g/L, for bromate a limit below 50 mu g/L has to be established. A self-made hi gh-capacity resin with 2-(dimethylamino)-ethanol functionality in comb ination with a UV-transparent elution system based on perchloric acid allows the separation and sensitive photometric detection of nitrite a nd bromate, even if high chloride concentrations are present. The high capacity of the strongly basic resin allows sample volumes of up to 4 00 mu L without disturbance of the separation. Detection limits for br omate and nitrite are 15 and 10 mu g/L, respectively. The direct analy sis of water samples with high salt contents, such as disinfected pool water, is possible by insertion of an on-line chloride removal step.