Evaluation of the uncertainty of the measurement results of the total organic carbon analyzer by film conductivity method

Objective: to establish a method to evaluate the uncertainty of measurement results of total organic carbon analyzer by film conductivity method Methods: the main sources of the uncertainty in the measurement process were analyzed, including the uncertainty of the working curve, the uncertainty caused by the reading resolution of the measuring instrument, the uncertainty caused by the non repetition of the measurement, the uncertainty caused by the standard solution, etc Results: the expanded uncertainty of hty-2500 TOC analyzer was u 95 = 49 (μ g · L-1) (k = 2) Conclusion: the method is accurate and reliable, which can provide a more accurate and simple method for the uncertainty evaluation of the measurement results of the membrane conductivity total organic carbon analyzer Key words: total organic carbon; uncertainty of measurement; classification No in film conductivity method: r917; document identification code: a; Article No.: 0254-1793 (2008) 12-0-0 evaluation of measurement uncertainty for the total organic carbon analyzer with membrane conductivity detection technology Yan Xiang Qing 1, Wu Xu-mei 2 （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 -1 got the expanded uncertainty which is U 95 = 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