原子荧光形态分析仪的校准方法及不确定度评定

Calibration method of atomic fluorescence speciation analyzer and uncertainty evaluation

通过分析原子荧光形态分析仪的工作原理,建立原子荧光形态分析仪的校准方法,提出了校准项目和技术指标。柱温箱温度设定值允许误差:±2℃;柱温箱温度稳定性:≤1℃/h;基线噪声:≤10 m V或≤1%FS;基线漂移:≤100 m V/(30 min)或≤10%FS;最小检测浓度:≤1.0μg/L;仪器线性:≥0.995;定性重复性:≤1.5%;定量重复性:≤3%。对原子荧光形态分析仪的最小检测浓度测量结果的不确定度进行了评定,当最小检测浓度为0.36μg/L时,扩展不确定度为0.13μg/L(k=2)。该校准方法计量特性满足校准要求,可用于评价原子荧光形态分析仪的性能。

The calibration method of atomic fluorescence speciation analyzer was established by analyzing the working principle of atomic fluorescence speciation analyzer.The calibration items and technical indexes were put forward,the column oven temperature set point margin of error:±2℃;the column temperature box temperature stability:≤1℃/h;the baseline noise:≤10 mV or≤1%FS;the baseline drift≤100 mV/(30 min)or≤10%FS;the minimum test concentration:≤1.0μg/L;the instrument linearity:≥0.995;the qualitative repeatability:≤1.5%;the quantitative repeatability:≤3%.The uncertainty of the determination of the minimum test concentration of atomic fluorescence speciation analyzer was evaluated,and the expanded uncertainty was 0.13μg/L(k=2)as the minimum test concentration was 0.36μg/L.Measuring characteristics of the calibration method can meet the requirements of calibration,it can be used to evaluate the performance of atomic fluorescence speciation analyzer.