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ISO 9498:1993 Fluorspar -- Experimental methods for checking the bias of sampling and sample preparation
standard by International Organization for Standardization, 07/01/1993
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Sampling and sample preparation of similar types of fluorspar is assumed to be carried out in accordance with the methods specified in ISO 8868. The experimental methods given are based on comparing the results obtained from the method to be checked with the results of a reference method which, for all practical purposes, is considered to produce practically unbiased results.