本文采用气相色谱法对黄油中脱氢乙酸含量测定进行不确定度研究,建立不确定度模型,通过分析并计算实验过程中的各不确定度分量,得到该方法的扩展不确定度。以期对检测结果的可靠性和准确性提供科学依据。当黄油中脱氢乙酸含量为0.15 g/kg时,其扩展不确定度为0.0064 g/kg(K=2,p=95%)。 In this paper, the determination of dehydroacetic acid content in butter by gas chromatography was studied. The uncertainty model was established. By analyzing and calculating the uncertainty components during the experiment, the extended uncertainty of the method was obtained. In order to provide a scientific basis for the reliability and accuracy of test results. When the content of dehydroacetic acid in butter is 0.15 g / kg, the uncertainty of expansion is 0.0064 g / kg (K = 2, p = 95%).