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As a result of the Environmental Protection Agency's (EPA) efforts to expand the capability of the Extraction Procedure (EP) leaching test to address organic components, including volatiles, and also to address some of its operational problems, a new leaching test, known as the Toxicity Characteristic Leaching Procedure (TCLP), has been developed. This test has been proposed for use in the Land Disposal Restrictions Rule and will soon be proposed in the expansion of the Extraction Procedure (EP) Toxicity Characteristic. Both actions were mandated by the Hazardous and Solid Waste Amendments of 1984. This paper describes the new leaching test with respect to its development, evaluation, and use. Data are presented regarding precision and ruggedness, and several operational aspects of the procedure are described in detail. Emphasis is placed on a comparison of the existing EP to the TCLP in terms of additional operational and analytical requirements. Finally, several aspects of the test are discussed that are being examined for possible improvement.
hazardous waste, hazardous waste characteristics, leaching tests
Environmental scientist, Office of Solid Waste (WH-562B), U.S. Environmental Protection AgencyNUS Corp., WashingtonGaithersburg, DCMD