The uncertainty in the determination of vanadium(Ⅴ)oxide in denitration catalyst by inductively coupled plasma atomic emission spectrometry(ICP-AES)was evaluated,the sources of uncertainty in the measurement process were analyzed,and the uncertainty components generated from sample weighing,sample digestion mode,standard solution preparation,working curve,measurement repeatability,molar mass,etc.were analyzed and calculated.Finally,the synthetic uncertainty and expanded uncertainty of the calculation method were calculated.According to the evaluation results of each uncertainty component,the maximum uncertainty of the measurement results comes from the uncertainty introduced by the preparation process of standard solution(about 43％),repeated measurement of samples(23％)and standard curve change(24％),which should be focused on and controlled during the measurement process.When the vanadium(Ⅴ)oxide content in the denitration catalyst is 2.00％,the uncertainty of scheme expansion is 0.032％,with a coverage factor of k=2 and a confidence probability of 95％.
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