Report1976

Certified and provisional reference materials available from the Canada Centre for Mineral and Energy Technology as of 1976

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Scientific Measurement and Uncertainty Evaluation Geological and Geochemical Analysis Analytical chemistry methods development

Abstract

Three low-grade tungsten ores, two of scheelite (CT-1 and TLG-1) and one of wolframite (BH-1, have been characterized and prepared for use as certified reference materials. This report is a detailed account of the interlaboratory program for obtaining the analytical results for tungsten, and the statistical treatment used to assign the recommended values, which are 1.04%, 0.42% and 0.083%, respectively, for CT-1, BIT-1 and TLG-1. Information is also given on the nature and origin of the three ores, and on the procedures used for their reparation and for assessing their homogeneity.

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