Evaluation of measurement uncertainty in determination of total arsenic content in soil by atomic fluorescence spectrometry based on control chart method
WANG Qian1,2, XU Chongying*1,2, YANG Jiahui1,2, CHEN Chao1,2, QI Chunjing1,2, WANG Xudong1,2
1. Hebei Key Laboratory of Mineral Resources and Ecological Environment Monitoring,Baoding 071051,China; 2. Hebei Research Center for Geoanalysis,Baoding 071051,China
Abstract：In the field of geological environment testing, the soil sample testing usually has many items and long process, which brings great difficulties to the uncertainty evaluation of measurement results in testing laboratories. The Top-down technology proposed in GB/T 27411-2012 was used to discuss the application of control chart method in the evaluation of measurement uncertainty for the determination of total arsenic content in soil by atomic fluorescence spectrometry(AFS). Under the condition of period precision, through the whole detection process measurement of laboratory quality control samples of arsenic in soil for 30 weeks, the abnormal value discrimination, normality, independence and resolution test of the data were carried out. The established control chart was analyzed according to the out-of-control criterion. Finally, the t test of the data was conducted to verify that the measurement system and measurement process were under control. The measurement uncertainty could be expressed by the standard deviation of period precision (sR′), and the rationality of using the method to evaluate the uncertainty was verified. Compared with Guide to the Uncertainty in Measurement (GUM) method, the control chart method showed strong operability and more reasonable results. It had a wider application prospect in the field of soil sample detection in geology, environment and agriculture.
王茜, 徐崇颖, 杨嘉晖, 陈超, 祁春景, 王旭东. 利用控制图法评定原子荧光光谱法测定土壤中总砷含量的测量不确定度[J]. 冶金分析, 2023, 43(2): 31-38.
WANG Qian, XU Chongying, YANG Jiahui, CHEN Chao, QI Chunjing, WANG Xudong. Evaluation of measurement uncertainty in determination of total arsenic content in soil by atomic fluorescence spectrometry based on control chart method. , 2023, 43(2): 31-38.
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