Evaluation of the Analytical Results of Tungsten and Tine Ores in the Proficiency Testing Program

GAN Lu; LUO Dai-hong; WU Shu-qi

doi:10.15898/j.cnki.11-2131/td.2015.01.015

2015 Vol. 34, No. 1

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GAN Lu, LUO Dai-hong, WU Shu-qi. Evaluation of the Analytical Results of Tungsten and Tine Ores in the Proficiency Testing Program[J]. Rock and Mineral Analysis, 2015, 34(1): 111-117. doi: 10.15898/j.cnki.11-2131/td.2015.01.015

Citation:

GAN Lu, LUO Dai-hong, WU Shu-qi. Evaluation of the Analytical Results of Tungsten and Tine Ores in the Proficiency Testing Program[J]. Rock and Mineral Analysis, 2015, 34(1): 111-117. doi: 10.15898/j.cnki.11-2131/td.2015.01.015

Evaluation of the Analytical Results of Tungsten and Tine Ores in the Proficiency Testing Program

National Research Center for Geoanalysis, Beijing 100037, China

Received Date: 04 April 2014

Revised Date: 09 June 2014

Accepted Date: 12 July 2014

Publish Date: 25 January 2015

Abstract

Abstract

According to the proficiency testing program (CNCA-13-A14) held by the National Certification and Accreditation Committee of China (CNCA), analytical data for W, Sn, Cu, Pb, Zn, Mo, Sb and Bi in tungsten and tin ores provided by 58 analytical laboratories in 30 provinces and autonomous regions were evaluated. Robust statistics, an international general statistical method, and Z-scores were used for evaluating the testing ability of the laboratories. According to the criteria for satisfactory results (Z-scores ≤2), the overall satisfaction rate for 58 laboratories was 88% (51 laboratories) and 12% of laboratories had suspect and outlier results. As a whole, the satisfaction rate for Sb, Pb and Zn in tungsten and tin ores was high, among which all of the analytical results of Zn in Tin Ores were satisfactory; results of W, Bi were slightly worse. Results of tungsten were better than those for tin ores. Moreover, the determination methods in all laboratories and the reasons for the outlier results were analyzed. The results of proficiency testing were objectively reflected for the testing ability and technical levels of the geoanalytical laboratory. Due to the determined gap among different laboratories, it was suggested that proficiency testing should be held periodically to improve the analytical ability and ensure the reliability of analytical data.
- tungsten ore /
- tine ore /
- analysis laboratory /
- proficiency testing /
- the reasons for the outlier analysis

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