1.Shaanxi Institute of Geology and Mineral Resources Experiment, Xi’an 710054,China; 2.Shaanxi Key Laboratory of Exploration and Comprehensive Utilization of Mineral Resources, Xi’an 710054,China
Abstract：For a long time,the precision in chemical phase analysis has not been scientifically quantified, and there were no control limit requirements for precision in inter-laboratory tests. The chemical phase analysis method with representative antimony ores was established. According to GB/T 6379.2-2004 of Accuracy(trueness and precision)of measurement methods and results—Part 2:Basic method for the determination of repeatability and reproducibility of a standard measurement method, the homogeneity examination were conducted by preparing the cooperation test samples of six levels and selecting major components or elements including Al2O3, TFe (in Fe2O3), CaO, MgO, Sb and S. The values of F of determination results were all less than the critical value (4.39), indicating the good homogeneity of test samples. The cooperation tests were performed in 8 laboratories. The variation of repeatability limit (r) and reproducibility limit (R) of the total antimony and its component in three mineral phase with the mass fraction change of antimony (m) were obtained. The results showed that the repeatability limit and reproducibility limit of total antimony were minimal among those of selected mineral phases. In other words, the repeatability limit and reproducibility limit of total antimony were less than that of antimony in mineral phases. The parameters of repeatability limit and reproducibility limit in chemical phase analysis method proved the basic characteristic that chemical phase analysis error was mainly from by other mineral phases. The precision of antimony ore chemical phase provided basis for the establishment and quality control of antimony ore chemical phase analysis method.
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