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Copper, lead, zinc and nickel concentrates. Experimental methods for checking the precision of sampling Ingestion-build-205840 PD IEC TR 63191 presents1 Scope This International Standard specifies methods for checking the precision of primary sampling, sample processing, chemical analysis, physical testing and determination of moisture content of copper, lead, zinc and nickel concentrates being carried out in accordance with the methods specified in ISO 12743, expressed in terms of standard deviations.