Coal combustion residuals (CCRs) contain variable amounts of trace metals, leading to questions about their potential impact in the environment. In order to answer these questions, the research team collected CCRs from seven coal-fired power plants in Florida for characterizations. The objectives were: 1) to measure the total concentrations of trace metals in CCR samples; 2) to measure the SPLP (synthetic precipitation leaching procedure) concentrations of trace metals in CCR samples; and 3) to compare the results to Florida Soil Cleanup Target Levels (SCTLs), EPA drinking water Maximum Contaminant Levels (MCLs) and analytical results for CCR samples from other states.

Twenty-seven CCR samples were collected from seven Florida coal-fired power plants, including 14 fly ash samples, 9 bottom ash samples and 4 samples of FGD residue. Their pH was grouped into 3 categories: low (8). Fly ash samples were mainly in low or high pH categories while bottom ash and FGD residue samples were predominantly in the medium category. Total concentrations of V, Mn, Pb, Ni, Cr, Cu, As, and Se and SPLP concentrations of Al, Fe, V, Ni, As, Mo and Sb for most samples were higher than Florida SCTLs and EPA MCLs. Due to potentially leachable concentrations of some trace metals in CCRs, certain beneficial use applications may require additional evaluation.



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