Uncertainty Evaluation for Determination of Aromatic Hydrocarbon Types in Middle Distillates by High Performance Liquid Chromatography Method With Refractive Index Detection
A high-performance liquid chromatography method with a differential refractive index detector was used to determine the aromatic hydrocarbon content in middle distillates.The uncertainty evaluation method was utilized to establish a mathematical model,analyze sources of uncertainty,compute the results for individual uncertainty components,and subsequently assess the combined standard uncertainty and expanded uncertainty.The evaluation results indicated that the uncertainty component arising from the preparation of standard solutions was the largest,with the uncertainty introduced during the mass weighing process being the most significant,followed by uncertainties from volumetric operations and the purity of standard substances.Subsequently,uncertainties introduced by the standard curve fitting were considered.Additionally,attention should be given to uncertainties introduced by numerical rounding and measurement repeatability.With a confidence interval of 95%,including a factor k=2,the determined results for the total polycyclic aromatic hydrocarbon mass fraction were 10.4%±1.1%,and for the total aromatic hydrocarbon mass fraction,the result was 23.9%±2.7%.
UncertaintyAromatic hydrocarbonsDiesel fuelDifferential refractive index detectorHigh performance liquid chromatography
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