摘要：A rapid determination of microamount of mercury by a combustion flask using the oxygen cylinder combustion method was examined. In this method, after the sample is burnt in an oxygen-filled flask of 500 ml capacity, mercury is absorbed in a solution of 20 ml of 2.0 N H2SO4 and 20 ml of 0.3% KMnO4 solution. This absorbed mercury is converted into mercuy vapor by reduction with SnCl2, and is determined by atomic absorption spectrophotometry. At 2 ppm of mercury in a fish meal, it's recovery rate was 98% in average, and at 1 ppm of mercury in fish meat, it's standard deviation was 0.028 ppm. When using two combustion flasks, amount of mercury in the samples can be determined at the rate of only 5 min per sample.
