CV-AFS DETERMINATION OF TRACE AMOUNTS OF MERCURY IN DRINKING WATER

Aiming to the purpose of determination of trace amounts of mercury in drinking water,the working conditions of the AFS-930 atomic fluorescenc spectrometer were optimized,especially a relatively low negative high voltage of PMT (270 V) and 10 W temperature of atomization (200 ℃) were chosen.Besides,low acidity (0.16-0.48 mol·L-1 HNO3) of the testing solution was used which was found more favorable to have a good stability and precision of the method.Under the optimum conditions,linear relationship was kept in the range of 0 to 1.0 μg·L-1 of mercury (r=0.999 9).RSD′s found at 3 concentration levels of mercury were less than 214%.Detection limit of this method achieved to 0.002 0 μg·L-1.Recoveries in the range from 95.8% to 1044%.