电感耦合等离子体质谱法测定生活饮用水中铅含量的不确定度评定

Evaluation of Uncertainty in the Determination of Lead Content in Drinking Water by Inductively Coupled Plasma Mass Spectrometry

采用电感耦合等离子体质谱法测定生活饮用水中铅含量,依据不确定度的评定与表示方法识别实验过程中测量不确定度的主要来源,对各不确定度分量进行量化评定,得出合成标准不确定度和扩展不确定度。结果表明,生活饮用水中铅含量为5.73μg·L^(-1),置信水平为95%,取包含因子k=2,其扩展不确定度为0.55μg·L^(-1),该实验过程中不确定度来源主要为校准曲线拟合和标准溶液配制过程。

The lead content in drinking water was determined by inductively coupled plasma mass spectrometry.According to the evaluation and representation of uncertainty,the main sources of measurement uncertainty in the experimental process were identified,and the various uncertainty components were quantified to obtain the synthetic uncertainty and extended uncertainty.The results showed that the lead content in drinking water was 5.73μg·L^(-1),the confidence level was 95%,the inclusion factor k=2,and the extended uncertainty was 0.55μg·L^(-1).The main sources of uncertainty in the experimental process were calibration curve fitting and standard solution preparation process.