由于测量不确定度便于使用、易于掌握，已被普遍认可作为表征测量结果质量的表达方式。运用红外分光测油仪测量标准样品石油类含量，对所有不确定度分量进行了量化，并找出测量不确定度的来源，从而计算其测量合成相对标准不确定度和扩展不确定度。结果表明：标准样品中石油类的测量结果为20．03 mg／L，扩展不确定度为0．42 mg／L（k＝2）；扩展不确定度贡献较大的主要分量有：加标回收率、样品重复测定和稀释过程引入的标准不确定度分量。%Thanks to its easy application, measurement uncertainty has been widely recognized as a way to express the results of measurement results.To determine the relative standard uncertainty and the expanded uncertainty , infrared spectrometric oil detec-tor was used to measure the petroleum standard samples, and a quantifying analysis, combining with a mathematical model, was exe-cuted from various measurement uncertainties .The results indicated that the concentration of petroleum hydrocarbon in standard samples was 20.03 mg/L and the expanded uncertainty was 0.42 mg/L(k=2).The uncertainty contribution of the measurement is mainly composed of recovery rate, the uncertainty components of repeated measurements of samples and the dilution .
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