原子荧光光度法测定卤味香膏中砷含量的不确定度评定

评价氢化物原子荧光光度法测定卤味香膏中砷含量的不确定度。方法 根据实验流程，分析实验过程中不确定度来源，评定不确定度分量，最后计算合成不确定度和扩展不确定度。结果 当卤味香膏样品中砷的含量为0.46 mg/kg 时, 扩展不确定度U=0.04 mg/kg，(k=2)。结论 氢化物原子荧光光度法测定卤味香膏样品中砷的含量时，对不确定度影响较大的是标准曲线拟合和标准溶液配制， 这两项分量占总不确定度的68.77 %；测定重复性和仪器校准次之，样品称量和试样定容影响较小。实验中要准确配制标准溶液，绘制合理标准曲线，关注线性范围，线性相关系数应大于0.997，保证检测结果的准确性。

Evaluation of the uncertainty in the determination of arsenic in bittern perfume by atomic fluorescence spectrometry

Objective Evaluation of the uncertainty in the determination of arsenic in bittern perfume by Hydride Atomic Fluorescence Spectrometry. Methods According to the experimental process, the sources of uncertainty in the experimental process are analyzed, the uncertainty components are evaluated, and finally the combined uncertainty and extended uncertainty are calculated. Results When the content of arsenic in the sample is 0.46 mg/kg, the expanded uncertainty U=0.04mg/kg (k=2). Conclusion When the content of arsenic in the sample of bittern perfume was determined by hydride atomic fluorescence spectrometry, the main influence on the uncertainty was standard curve fitting and standard solution preparation, which accounted for 68.77% of the total uncertainty; the second was the repeatability of determination and instrument calibration, and the second was sample weighing and sample constant volume. In the experiment, the standard solution should be accurately prepared, the reasonable standard curve should be drawn, the linear range should be concerned, and the linear correlation coefficient should be greater than 0.997 to ensure the accuracy of the test results.