石墨炉原子吸收法测定茶叶中铅的不确定度分析
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摘要
目的通过石墨炉原子吸收法测定茶叶中的铅不确定度。方法根据《测量不确定度评定和表示》中的方法和公式,对该方法的不确定度进行分析。结果标准曲线方程引入的不确定度是0.015 8,电子天平称量引入的不确定度是0.000 16,重复测定样品引入的不确定度是0.015 5,样品消化液定容体积引入的不确定度是0.000 74,标准储备溶液引入的不确定度是0.001 5,标准溶液稀释过程中体积引入的不确定度是0.014 4。结论标准曲线方程引入的不确定度对检测结果的影响最大。
[Objective]To determine the uncertainty of Pb in tea by graphite furnace atomic absorption.[Methods]According to the methods and formulas of " Uncertainty in Measurement and representation ",the uncertainty of the method was analyzed. [Results]The analysis showed the uncertainty introduced by standard curve equation was 0.015 8,0. 000 16 of electronic weighing scales,0. 015 5 of repeated determination of the sample,0. 000 74 of sample digestion liquid volume,0. 001 5 of standard stock solution,0. 014 4 of standard solution dilution volume in the process.[Conclusion]The uncertainty introduced by standard curve equation possesses the maximum effect on the test results
[Objective]To determine the uncertainty of Pb in tea by graphite furnace atomic absorption.[Methods]According to the methods and formulas of " Uncertainty in Measurement and representation ",the uncertainty of the method was analyzed. [Results]The analysis showed the uncertainty introduced by standard curve equation was 0.015 8,0. 000 16 of electronic weighing scales,0. 015 5 of repeated determination of the sample,0. 000 74 of sample digestion liquid volume,0. 001 5 of standard stock solution,0. 014 4 of standard solution dilution volume in the process.[Conclusion]The uncertainty introduced by standard curve equation possesses the maximum effect on the test results
引文
[1]中华人民共和国国家计量技术规范.测量不确定度评定与表示[S].1999.
[2]胡晓燕.论测量不确定度[J].理化检验化学分册,2002,38(8):406-409.
[3]CNAS实验室的指南性文件.化学分析中的不确定度的评价指南[S].CNAS-GL06.2006:88-100.
[4]丁宇,劳宝法,肖珺.石墨炉原子吸收法测定水中铅的不确定度分析[J].上海预防医学杂志,2009.21(8):387-389.
[5]董朝明,刘超.石墨炉原子吸收法测定食品中铅含量结果不确定度评定探讨[J].杭州农业科技,2005(5):15-17.
[2]胡晓燕.论测量不确定度[J].理化检验化学分册,2002,38(8):406-409.
[3]CNAS实验室的指南性文件.化学分析中的不确定度的评价指南[S].CNAS-GL06.2006:88-100.
[4]丁宇,劳宝法,肖珺.石墨炉原子吸收法测定水中铅的不确定度分析[J].上海预防医学杂志,2009.21(8):387-389.
[5]董朝明,刘超.石墨炉原子吸收法测定食品中铅含量结果不确定度评定探讨[J].杭州农业科技,2005(5):15-17.