直接测汞仪的校准及检出限不确定度评定
吴晓惠,黄彬磊,张佳仁,孙凤,朱佳奇
上海市质量监督检验技术研究院,上海 201114
Calibration of direct mercury analyzers and uncertainty evaluation of detection limit
吴晓惠,黄彬磊,张佳仁,孙凤,朱佳奇
Shanghai Institute of Quality Inspection and Technical Research, Shanghai 201114, China
摘要:介绍直接测汞仪的计量特性和校准方法。校准项目和技术指标:线性误差在±10%之内,检出限不大于1.0 ng,重复性不大于3%。直接测汞仪检出限的不确定度由精密度测量不确定度、回归曲线测量不确定度、标准物质浓度引入的不确定度、温度引入的不确定度组成。对各不确定度分量进行评定,得到检出限的扩展不确定度为U=0.06 ng (k=2)。该方法能客观全面反映仪器的计量性能,可为该类仪器的校准和计量标准的考核提供参考。
Abstract:The measurement characteristics and calibration method of direct mercury meter were introduced. The calibration items and technical indicators were as follows: linear error was within ±10%, detection limit was not more than 1.0 ng and repeatability was less than 3%. The uncertainty of detection limit consisted of precision measurement uncertainty, regression curve uncertainty, standard material concentration uncertainty and temperature uncertainty. The components of the uncertainty were evaluated, the expanded uncertainty of detection limit was 0.06 ng (k=2). This method can objectively and comprehensively reflect the measurement performance of the instrument, which can provide reference for the calibration of this kind of instrument and the examination of measurement standard.
关键词:直接测汞仪;检出限;扩展不确定度
Keywords:direct mercury analyzer; detection limit; expanded uncertainty
本文引用格式:
吴晓惠,黄彬磊,张佳仁,等.直接测汞仪的校准及检出限不确定度评定[J].化学分析计量,2019,28(4):103-106.
WU X H,HUANG B L,ZHANG J R,et al. Calibration of direct mercury analyzers and uncertainty evaluation of detection limit[J]. Chemical analysis and meterage,2019,28(4):103-106.
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