Abstract
The particulate material in the stack effluent of a coal-fired power plant was collected and fractionated with an in-stack cascade impactor. Samples of the pulverized coal and process ashes were taken on the same days. These materials were analyzed for 34 elements by instrumental neutron and photon activation analysis. Elements on the in-stack particulates can be separated into three groups by computing enrichment factors relative to the coal for each particle size fraction. These groups are compared to proposed mechanisms for trace element fractionation during combustion.
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