Abstract：At present, the evaluation technologies for uncertainty of measurement can be roughly divided into two groups: “bottom-up” and “top-down”. The procedures of “bottom-up” technique are complex and it has limitation in evaluation of measurement uncertainty in chemical testing laboratories. The operation of control chart method in “top-down” technique is easy, and meanwhile it can make up the limitation of “bottom-up” technique in evaluation of measurement uncertainty. As an important approach for laboratory quality control management, the control chart method has been widely recognized. According to national standard GB/T 27407—2010, the application of control chart in quality control management during determination of silver content in copper concentrate was discussed. The normality, independence and resolving ability of measurement results of silver content in standard sample (GBW 07166) were tested in laboratory routine analysis. The control chart was prepared. The uncertainty of method was evaluated by t test and its rationality was analyzed. The calculation results of control chart for silver content determination in quality control sample of copper concentrate were listed as follows: the average value was 43.8g/t, the intermediate precision was 1.6g/t, and the expanded uncertainty was 3.2g/t, which could meet the adaptive hypothesis of normality, independence and resolving ability of measurement results. There was no out-of-control point in control chart, indicating that whole laboratory testing system was in controlled state. The control chart method could reflect the testing level of laboratory within a relatively long period. It was applicable for the quality control of testing laboratory and had practical application value.
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KANG Jing, WANG Jing-zhong, ZHAO Jing. Application of control chart in quality control management during determination of silver in copper concentrate. , 2018, 38(1): 75-80.
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