| 测定食品标准物质中铅含量的不确定度评定 |
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| 引用本文： | 殷忠,蒋励,张卫国.测定食品标准物质中铅含量的不确定度评定[J].职业与健康,2011,27(5):517-520. |
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| 作者姓名： | 殷忠 蒋励 张卫国 |
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| 作者单位： | 贵州省疾病预防控制中心卫检所理化室,贵阳市,550004 |
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| 摘 要： | 目的对氢化物原子荧光法测定食品标准物质中铅含量进行不确定度的评定,了解不确定度来源及其大小并采取相应措施加以纠正,提高实验室铅检测能力和质量控制能力。方法用原子荧光仪测定食品标准物质中铅含量,根据测定方法建立数学模型,分析测量不确定度来源,计算各不确定度分量和扩展不确定度。结果当k=2(95%置信概率)时,食品标准物质中铅含量为0.36 mg/kg,不确定度为±0.035 mg/kg。结论测量不确定度的主要来源为标准曲线拟合引入的不确定度以及重复测定时产生的不确定度。实验室分析误差可控制在容许值内。
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| 关 键 词： | 食品标准物质 铅 不确定度 |
Evaluation of Uncertainty in Determining Lead contents in the Standard Reference Material of Food |
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| YIN Zhong,JIANG Li,ZHANG Wei-guo.Evaluation of Uncertainty in Determining Lead contents in the Standard Reference Material of Food[J].Occupation and Health,2011,27(5):517-520. |
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| Authors: | YIN Zhong JIANG Li ZHANG Wei-guo |
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| Institution: | YIN Zhong,JIANG Li,ZHANG Wei-guo(Guizhou Center for Disease Control and Prevention,Guiyang,550004,China) |
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| Abstract: | Objective]To evaluate the uncertainty in determining lead contents in the standard reference material of food by hydride generation atomic fluorescence spectrometry,to understand the sources of uncertainty and its size,to adopt corresponding measures to correct it,and enhance the technical level of testing lead and lab quality control capability. Methods]Atomic fluorescence spectrometer was used to determine lead content in food reference material.The mathematical model was established based on the measur... |
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| Keywords: | Standard reference material of food Lead Uncertainty |
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