原子荧光光度法测定卤味香膏中砷含量的不确定度评定

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

中文关键词:  原子荧光光度法  卤味香膏  砷  不确定度

英文关键词:atomic fluorescence spectrometry  bittern perfume  arsenic  uncertainty

中文摘要:

      目的 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 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)。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。结论 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, 保证检测结果的准确性。

英文摘要:

      Objective To evaluate the uncertainty of the determination of arsenic content in bittern perfume by hydride atomic fluorescence spectrophotometry. Methods The source of uncertainty in the experiment was analyzed, the component of uncertainty was evaluated, and finally the synthetic uncertainty and extended uncertainty were calculated. Results When the content of arsenic in the bittern perfume sample was 0.46 mg/kg, the expanded uncertainty U=0.04 mg/kg (k=2). 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. Conclusion In the experiment, the standard solution should be accurately prepared, the reasonable standard curve should be drawn, the linear range should be concerned to ensure the accuracy of the test results.