| ZHOU Cheng-ying,LIU Mei-zi,ZHANG Hua,LI Bao-cheng,MAN Xu-guang,LIU Ying,ZANG Mu-wen.Evaluation of the Interlaboratory Comparison Results of the Chemical Composition of Copper Concentrates and Analysis of the Causes of Outliers[J].Rock and Mineral Analysis,2021,(4):619-626 |
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| Evaluation of the Interlaboratory Comparison Results of the Chemical Composition of Copper Concentrates and Analysis of the Causes of Outliers |
| Received:May 21, 2020 Revised:September 21, 2020 |
| DOI：10.15898/j.cnki.11-2131/td.202005210074 |
| Key words: copper concentrate interlaboratory comparison proficiency testing outlier acid dissolution iodometry |
| Author Name | Affiliation | | ZHOU Cheng-ying | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | LIU Mei-zi | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | ZHANG Hua | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | LI Bao-cheng | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | MAN Xu-guang | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | LIU Ying | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China | | ZANG Mu-wen | Proficiency Testing Center, China United Test & Certification Co., LTD, Beijing 101407, China |
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| Abstract: |
BACKGROUND: Composition analysis of copper concentrate is an important method to determine its quality, especially the analysis of the main element copper. Currently, the main analytical methods for the determination of copper content in copper concentrate include iodometry, inductively coupled plasma-optical emission spectrometry (ICP-OES), flame atomic absorption spectrometry (FAAS), X-ray fluorescence spectrometry (XRF), and electrolytic gravimetric methods.
OBJECTIVES: To ensure the uniformity, accuracy, and reliability of the standard values, interlaboratory comparison activities for the determination of copper, magnesium, lead, and zinc in copper concentrate were organized.
METHODS: Through the statistical analysis of the test results of the participating laboratories, the technical level and ability of the participating laboratories in the determination of copper, magnesium, lead, and zinc in copper concentrates were evaluated.
RESULTS: The results showed that most laboratory results were satisfactory, the satisfaction rate of copper in the copper concentrate was 92.9%, and the average satisfaction rate of copper, magnesium, lead, and zinc was 89.0%. The outliers in a few laboratories were mainly attributed to sample pretreatment, lack of understanding and mastering of the analytical methods by the testing personnel, and other related factors, such as the instrument status.
CONCLUSIONS: Because of incomplete sample decomposition, the alkali leaching method could not be used for pretreatment of copper concentrate. Additionally, the alkali fusion method is not recommended for copper concentrate pretreatment because of its complicated process and matrix interference. Acid dissolution titration is preferred as a pretreatment method for the determination of copper in the copper concentrate. The acid-dissolution ICP-OES method for simultaneous determination of Cu, Mg, Pb, and Zn in the copper concentrate is efficient and rapid with satisfactory results. However, further experiments are required to investigate their stabilities. |
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