Abstract：A method of determining trace Hg in coal by microwave digestion and cold vapor atomic fluorescence spectrometry is reported. The digestion system of HNO3-HCl-HF was evaluated. The experimental conditions of microwave digestion, including pressure, temperature, power and time of digestion were evaluated. The operating conditions such as flow rate of carrier gas, flow rate of shield gas and negative high voltage, and interference were also investigated. Testing results show that the detection limit is 0.03 ng·mL-1 and RSD (n=7) is below 5%. This method is simple and rapid. The treatment method was applicable to determining trace Hg in coal and gave results that were in good agreement with the certified values of the standard reference material.
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