Study on consistency criterion between the results of different analytical methods in standard verification experiments
ZHANG Baihui1, GUO Chao1, FAN Shuang1, DU Zhenyu2,3,YIN Huimin*2,3,LI Yuwu1,2,3
1. Guohuan Oasis Gu'an Environmental Technology Co., Ltd., Langfang 065500, China; 2. Environmental Development Centre of the Ministry of Ecology and Environment, Beijing 100029, China; 3. National Research Center for Environmental Analysis and Measurements, Beijing 100029, China
Abstract：The comparison of measurement results between different analytical methods is used to judge the consistency between the two methods, and it is a practical problem often encountered by testing laboratories. Its application background includes the comparison between the new method and the classic method in the method standard verification experiment. Especially in the absence of standard samples and data conditions that apply the t-value test, it is particularly important to choose the appropriate criterion. The contents of heavy metals such as As, Pb, Cu, Zn, Ni, Cr, Co, V and Mn in soil and water sediments were determined by wavelength dispersion X-ray fluorescence spectrometry (WD-XRF) and energy dispersion X-ray fluorescence spectrometry (ED-XRF). A group of data were used to discuss explore the possibility for judgment of significant differences in results using the ratio method, linear model regression parameters, t-value test method based on relative deviation, and pass rate based on comparison with relative deviation limit. The results showed that: a group of verification samples were measured by two methods; when the relative deviations of two measurement results of elements were compared with the relevant limits, the pass rate could be used to determine consistency of the results of the two methods. The proposed method complied with the daily quality control technical specifications and had strong practicability. The relative deviation limits obtained from empirical model formula filled up the blanks of some elements in the quality control specifications, which laid the foundation for the application of this criterion. Other judgment methods, such as the ratio method (graphic method), the regression model method (regression slope, correlation coefficient), and the t-value test method based on relative deviation were helpful for finding problems and could help to determine the consistency between the methods.
张百慧, 郭超, 范爽, 杜祯宇, 殷惠民, 李玉武. 分析方法标准验证实验中不同方法结果间一致性判据研究[J]. 冶金分析, 2021, 41(5): 18-27.
ZHANG Baihui, GUO Chao, FAN Shuang, DU Zhenyu,YIN Huimin,LI Yuwu. Study on consistency criterion between the results of different analytical methods in standard verification experiments. , 2021, 41(5): 18-27.
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