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技術文章
薄膜—電導率法總有機碳分析儀測量結果不確定度的評定
發(fā)布時間：2009-1-15
摘要目的：建立薄膜—電導率法總有機碳分析儀測量結果不確定度的評定方法。方法：分析了測量過程中不確定度的主要來源，即工作曲線的不確定度、測量儀器讀數(shù)分辨率導致的不確定度、測量不重復性引起的不確定度、標準溶液引起的不確定度等，分別量化后合成標準不確定度，得到總有機碳測量的擴展不確定度。結果：通過對HTY-2500總有機碳分析儀在2000μg·L-1測量點測量結果不確定度的評定，其擴展不確定度為U95 = 49（μg·L-1）（k=2）。結論：本方法所建立的測量結果不確定度評定方法準確、可靠，可為薄膜-電導率法總有機碳分析儀的測量結果不確定度評定提供較為準確簡便的方法。
關鍵詞：總有機碳；測量不確定度；薄膜—電導率法
中圖分類號：R917 文獻標識碼：A 文章編號：0254-1793（2008）12-0-0
Evaluation of Measurement Uncertainty for the Total Organic Carbon Analyzer with Membrane Conductmetric Detection Technology
YAN Xiang-qing1，WU Xu-mei2
（1.Zhejiang Province Institute of Metrology, Hangzhou, 310013, China;2.Hangzhou Tailin Bioengineering Equipments Co. LTD, Hangzhou, 310052, China）
Abstract: Purpose: The article set up an evaluation method of measurement uncertainty for the total organic carbon analyzer with membrane conductmetric detection technology. Method: The article analyzed the main resources of the uncertainty of the measurement, which include uncertainty of the working curve, uncertainty of the resolution ratio of the instrument, uncertainty of measure unrepeatability, uncertainty of standard solution, etc. It quantified these uncertainties respectivelycomposed them to a standard uncertainty. Finally it got the expanded uncertainty of the total organic carbon measurement. Result: It evaluated the measurement uncertainty of the total organic carbon analyzer at 2000μg·L-1got the expanded uncertainty which is U95 = 49（μg·L-1）（k=2）. Conclusion: The evaluation method of measurement uncertainty set up by the article is accurate, reliable,it can offer comparatively exactconvenient method for measurement uncertainty evaluation of the total organic carbon analyzer with membrane conductmetric detection technology.
Key words: total organic carbon; uncertainty of a measurement; membrane-conductometric detection technology