Study on the influence of measurement uncertainty on evaluation results of gas detection proficiency testing by En score method
ZUO Zehao, LIU Tao, SUN Zijie, XING Xiaoru*
Environmental Development Center of the Ministry of Ecology and Environmnet, Institute for Reference Materials, State Environmental Protection Key Laboratory of Pollutant Metrology and Reference Materials Research, Beijing 100029, China
Abstract：During the proficiency testing work of environmental air monitoring, the gas samples are usually prepared using the way of one-bottle-by-one-bottle due to the influence of gas container and filling method. The designated value of gas sample in each bottle will have certain difference. Therefore, the proficiency testing results of gas detection are usually evaluated by the En score method. When the En score method was used, the measurement uncertainty in laboratory will directly influence on the evaluation results of proficiency testing. The correct evaluation of measurement uncertainty in laboratory in the necessary condition for the rational use of En score method. The proficiency testing plan of SO2 detection in air was used as an example. The relationship between En scores and uncertainty was analyzed to obtain the effective range of measurement uncertainty in laboratory. The standard deviation of proficiency testing evaluation in two laboratories was 0.64 μmol/mol and 1.23 μmol/mol, respectively. The effective range of uncertainty was 0.34-1.92 μmol/mol and 0.66-3.69 μmol/mol, respectively. It provided reference for effectively evaluating the laboratory results by En score method and guiding laboratory to effectively evaluate the measurement uncertainty.
左泽浩, 刘涛, 孙自杰, 邢小茹. 测量不确定度对En值法评价气体检测能力验证结果的影响探究[J]. 冶金分析, 2021, 41(7): 35-39.
ZUO Zehao, LIU Tao, SUN Zijie, XING Xiaoru. Study on the influence of measurement uncertainty on evaluation results of gas detection proficiency testing by En score method. , 2021, 41(7): 35-39.
[1] CNAS-RL02 能力验证规则[S].中国合格评定国家认可委员会,2018. [2] 刘涛,李帅,邢小茹,等.环境大气污染物检测能力验证结果评价[J].理化检验(化学分册), 2016,52(9):1057-1061. LIU Tao,LI Shuai,XING Xiaoru,et al.Evaluation results of environmental atmospheric pollutant detection proficiency testing[J].Physical Testing and Chemical Analysis (Part B:Chemical Analysis),2016,52(9):1057-1061. [3] 邢建,池靖,徐琳.开展实验室能力验证是环境监测质量管理的重要环节[J].现代测量与实验室管理,2006,14(3):44-46. XING Jian,CHI Jing,XU Lin.Conducting laboratory proficiency testing is an important part of environmental monitoring quality management[J].Advanced Measurement and Laboratory Management,2006,14(3):44-46. [4] 邢小茹,左泽浩,杨珺,等.空气中二氧化硫检测能力验证技术研究进展[C]//第二届环境监测与预警技术交流会暨中国环境科学学会环境监测专业委员会2018年学术年会论文集.深圳:中国环境科学学会,2018:213-222. [5] ISO 13528 Statistical methods for use in proficiency testing by interlaboratory comparison[S].International Organization for Standardization,2015. [6] CNAS GL002 能力验证结果的统计处理和能力评价指南[S].中国合格评定国家认可委员会,2018. [7] ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories[S]. [8] 刘涛,邢小茹,鞠平,等.采用能力验证数据评估环境监测结果测量不确定度[J].中国环境监测,2016,32(2):77-80. LIU Tao,XING Xiaoru,JU Ping,et al.The evaluation of measurement uncertainty in environmental laboratories by proficiency testing[J].Environmental Monitoring in China,2016,32(2):77-80. [9] 刘涛,樊强,田文,等.环境气体标准样品量值的计算及不确定度分析[J].环境监测管理与技术,2009(3):62-65. LIU Tao,FAN Qiang,TIAN Wen,et al.Determination and evaluation of uncertainty on environmental gas reference materials[J].The Administration and Technique of Environmental Monitoring,2009(3):62-65.
