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This European Technical Specification describes a test that can be used to determine whether or not the material to be tested possesses reducing characteristics. If this is the case, another test is used to quantify the reducing capacity of this material or its eluates. Based on the results of this Specification it can be established whether leaching under practical conditions can differ considerably from leaching under standard aerobic laboratory conditions and whether there is justification for testing leaching under low-oxygen conditions. This document has been prepared by Technical Committee CEN/TC 292 "Characterization of waste", the secretariat of which is held by NEN (Netherlands). The responsible German committee is NA 119-01-02-05 UA "Elutionsverfahren" ("Leaching methods") of NA 119-01-02 AA "Abfall- und Bodenuntersuchung" ("Waste and soil investigation") at DIN Standards Committee Water Practice (NAW).