Uncertainty Evaluation of Methylbenzene's Concentration in Standard Sample of Benzene Series Based on Control Chart Method
The concentration of methylbenzene in standard sample of Benzene series was determined by gas chro-matography and then the uncertainty was evaluated.According to GB/T 27411-2012 Common Uncertainty As-sessment Methods and Representations in Testing Laboratories(Control Chart Method),the uncertainty of the measurement results was analyzed and quantified.Under the condition of period precision,standard sample of Benzene series was determined by gas chromatography,and 40 measurement results were obtained.After elimina-ting the outliers and verifying the normality and independence,the exponentially weighted moving average chart(EWMA-chart)was established.The measurement uncertainty of methylbenzene was evaluated by the control chart method.The result showed that,under the condition of bias-controlled period precision measurement,the ex-tended uncertainty of methylbenzene is±5.16 mg/L.
NETL
NSTL
万方数据
