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Preparation of Four Chromium Ore Reference Materials
Author(s) -
Cheng Zhizhong,
Huang Hongku,
Liu Mei,
Gu Tiexin,
Yan Weidong,
Yan Mingcai
Publication year - 2013
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/j.1751-908x.2012.00162.x
Subject(s) - chromite , homogeneity (statistics) , chromium , homogeneous , mineralogy , metallurgy , certified reference materials , relative standard deviation , materials science , geology , chemistry , mathematics , chromatography , statistics , detection limit , combinatorics
The preparation and characterisation of four chromium ore reference materials are described in this paper. The sample material for GCr‐1, GCr‐3 and GCr‐4 was collected from chromite deposits in Tibet, Qinghai province and Inner Mongolia. GCr‐2 is a composite sample from GCr‐1 and GCr‐4. Sample homogeneity was tested by WD‐XRF and the relative standard deviations were < 1.0%. An F‐test showed that all four materials were homogeneous. Thirteen laboratories involved in the inter‐laboratory programme provided 672 determinations (eighteen oxides and elements). Sixteen components were characterised as certified values, of which Cr 2 O 3 ranged from 17.59 to 57.80% m/m. The contents of FeO and CO 2 were taken as reference values.