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Copper, lead, zinc and nickel concentrates. Determination of mass loss of bulk material on drying Ingestion-build-103253 BS EN 61855 provides performance1 Scope This International Standard specifies methods for the determination of moisture content of a lot of copper, lead, zinc or nickel concentrate, defined as the percentage mass loss of the moisture test portion under the conditions of drying specified in this document. In order to obtain an unbiased estimate of the metal content of the lot, it is important that the same drying conditions are used for the determination of bulk and hygroscopic