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Abstract
A cold-vapor atomic absorption system is described for the determination of volatile mercury in the stack gases of a municipal solid-waste incinerator. The gases are washed in a K/sub 2/CR/sub 2/O/sub 7//HNO/sub 3/ solution. By oxidation of the mercury in the washing bottle, a 99% collection efficiency is obtained. Total collection is guaranteed by adding a gold-coated sand absorber to the sampling train. After sampling, aliquots of the diluted absorbing solution are analyzed according to the reduction-aeration method with SnC/sub 12/. The released mercury is concentrated on a gold absorber. After thermal desorption from the gold, the mercury is measured in a modified atomic absorption spectrometer. The detection limit of the combined method is 1 ng. Calibration is achieved by injection of elemental mercury onto the gold. Generally, the reproducibility is better than 3%. The mercury concentrations found vary from 121 to 163 mu g of Hg per cubic metre of flue gas.
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