THE PREPARATION OF THREE BASE-METAL REFERENCE MATERIALS: LEAD CONCENTRATE, IGS-42, ZINC CONCENTRATE, IGS-43 AND COPPER MATTE, IGS-44 |
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Authors: | Brian Lister |
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Institution: | British Geological Survey, Geochemistry Directorate, London WC1X 8NG, United Kingdom |
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Abstract: | Three base-metal concentrates, each weighing 25 kg, were ground to -175 mesh (90 μm) and homogenised. They were then sub-sampled into foil-lined envelopes and sealed under argon before being issued to 27 participating laboratories for analysis. Over 4000 analytical results were returned and, after evaluation, a total of 37 elements within the three samples have been given recommended or more cautious probable values. The high standard of precision attained has enabled clear-cut distinctions to be made between methods for the determination of some elements. The most important of these is between titrimetry and electrogravimetry in the determination of copper. |
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