Determination of mercury in essence with atomic fluorescence spectrometry aftermicrowave digestion

Method for determination of heavy metals mercury using hydride generation atomic fluorescence spectrometry was established.Effects of pre-treatment methods and atomic fluorescence instruments on final results were studied.The optimum conditions were as follows: digest samples with nitric acid and hydrogen peroxide with ratios by 3∶2,digest samples with microwave under maximum temperature at 180℃ for 25 min;analyse digested sample with reducing agent of potassium borohydride by 15 g/L and with carrier liquid of 5%hydrochloric acid.Detection limit of mercury was 0.0093 μg/L,the relative standard deviation at 1.5%and the recovery ranged in 93~104%underthe optimum conditions.