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In order to determine the potential mobility of lead, cadmium, chromium, copper, zinc, calcium and manganese in fly ash samples from four locations in Northern Greece, a laboratory leaching test was used. Their leachability was assessed when these wastes are disposed of. The cascade leaching test was used at liquid to solid ratios (L/S) ranging between 5 and 100. All fly ash samples exhibited strong alkaline reaction, as indicated by pH values > 11.75 at L/S = 10 and contact time of 10 min. In general, Ca showed the highest leachability and Mn the lowest in all samples. The six metals studied in fly ash from Amide0 exhibited an increase in the leachate concentration as the leachant pH was reduced from 8 to 4. At all pH values lead was the most extractable, followed by cadmium, while copper and manganese were the least leachable.
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