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ISO 8542:1986 Manganese and chromium ores -- Experimental methods for evaluation of quality variation and methods for checking the precision of sampling
standard by International Organization for Standardization, 11/01/1986
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Specifies experimental methods for the evaluation of quality variation of manganese and chromium ores, whether natural or processed, for the purpose of defining sampling procedure by the mass-basis systematic method and the two-stage method as specified in the relevant International Standards. It also specifies methods for checking the precision of sampling by the mass-basis systematic method and the two-stage method.