Simultaneous determination of arsenic and mercury in food by microwave digestion and atomic fluorescence spectroscopy

A process of closed and high pressure microwave digestion with atomic fluorescence spectrometer for simultaneously determine As and Hg in food was established.Compared with traditional wet digestion method,the microwave digestion features simple operation,fast,little interference and excellent process controllability.After detect rice,meat,mineral water,aquatic product and so on,we find the detection limits for arsenic and mercury were 0.030 6 μg/L and 0.005 2 μg/L respectively.The relative standard deviation for As was 2.40%,while 1.39% for Hg.The recovery for As was in the rang of 99.4%～101.2% and 94.5%～106.5% for Hg.And the As correlation coefficient was 0.999 7,while the Hg was 0.999 6.The result is fine,and is fit for simultaneously determine As and Hg in food.