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Certified Reference Materials of Molybdenum Ore and Molybdenum Concentrate ( GBW 07141, GBW 07142, GBW 07143 and GBW 07144)
Author(s) -
Liu Mei,
Cheng Zhizhong,
Huang Hongku,
Gu Tiexin,
Yan Weidong,
Wang Lijun,
Bai Jinfeng
Publication year - 2018
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12219
Subject(s) - molybdenum , homogeneous , certified reference materials , homogeneity (statistics) , metallurgy , relative standard deviation , materials science , chemistry , mathematics , detection limit , chromatography , statistics , combinatorics
This study describes the preparation and characterisation of certified reference materials of three molybdenum ores ( GBW 07141 to GBW 07143, abbreviated to GM o‐1 to GM o‐3) and one molybdenum concentrate ( GBW 07144, abbreviated to GM o‐4). The source of these materials was molybdenum deposits in Luanchuan in Henan Province, China. Sample homogeneity was tested by WD ‐ XRF . All the relative standard deviations were < 3.0%, and F ‐tests showed that all four materials were homogeneous. Thirteen laboratories participated in this interlaboratory programme, and to set the values, various reliable analytical methods based on different principles were adopted. Up to twenty‐six elements and compounds in the three molybdenum ores and eighteen components in the molybdenum concentrate were characterised as certified values. Owing to the wide spread of the data, only indicative values could be obtained for Ag and Re in GM o‐1 and for nine components in GM o‐4. The certified values and uncertainties for Mo of the three molybdenum ores and the molybdenum concentrate were, respectively, 0.066 ± 0.003, 0.15 ± 0.01, 0.54 ± 0.02 and 50.08 ± 0.14% m/m .