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The mercury emissions of coal combustion and the mercury concentration of coals in China were studied. The average mercury concentration of coals is 0.22 mg/kg. By founding a monitor program, we measured the mercury emission factors of coal-fired boilers, which are from 64.0% to 78.2%. On the basis of other data, we estimated that the total amount of mercury emission from coal combustion was 302.87 t in 1995, including 213.8 t into atmosphere and 89.07 t into ash and cinder. The results show that 2493.8 t of mercury was emitted into the atmosphere during the coal combustion process from 1978 to 1995, and the mercury emission intensity is higher in Beijing, Shanghai, and Tianjin.
Wang et al. (2000) studied this question.