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THE PREPARATION OF THREE BASE‐METAL REFERENCE MATERIALS: LEAD CONCENTRATE, IGS‐42, ZINC CONCENTRATE, IGS‐43 AND COPPER MATTE, IGS‐44
Author(s) -
Lister Brian
Publication year - 1987
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1987.tb00002.x
Subject(s) - copper , base (topology) , base metal , zinc , metal , geology , metallurgy , materials science , mathematics , mathematical analysis , welding
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.