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Abstract
Disposal of fly ash particulates in landfills or holding ponds is a potentially significant source of trace metals to the environment. Leaching of chromium from several fly ashes with 1 millimolar bicarbonate or 10 μg/ml ethylenediaminetetraacetic acid solutions mobilized between 1.3 and 4.1% of the total chromium after 15 days. The estimated annual environmental insult from this mobilization ranges from 3.4 x 107 g to 1.1 x 108 g Cr. The patterns of Cr release as a function of time indicate that the principle physiochemical factors responsible for the mobilization observed are: the chemical form of Cr in the ash, the matrix components with which Cr is associated, the chemical composition of the extracting solutions, and the spatial distribution of the chromium‐containing materials within the fly ash particulates.
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Notes
Present Address: Standard Oil Company, 4440 Warrensville Center Road, Cleveland, Ohio 44128
To whom correspondence should be addressed.