TCLP is commonly used either to determine whether a waste is hazardous or to determine whether a treated waste meets the treatment standards for land disposal. This test provides useful information on the potential leachability of metals in sediments under moderately (pH 4.9) or strongly (pH 2.9) acid conditions. In general, the amounts of metals extracted with the solution were greater than those obtained under less acidic conditions. In order to test the potential leachability of metals in treated sediment and
to evaluate the long-term stable effect of additives on in-situ stabilization, strongly acid solutions (pH 2.9) was chosen in this study. TCLP testswere performed usingUSEPAMethod 1311. This procedure
uses a 5.7-ml aliquot of glacial acetic acid (pH 2.97±0.03) in 500ml of deionized water and 64.3 ml of 1N NaOH, diluting to a volume of 1 L. A 100-ml aliquot of this solution was used to extract Pb2+, Zn2+, Cu2+, Cd2+ and Ni2+ from the sediment samples, each weighing 5 g.