Evaluation of Uncertainty in the Determination of Ethyl Acetate in Baijiu by Internal Standard Gas Chromatography
The internal standard method of gas chromatography was used to determine the content of ethyl acetate in Baijiu.Through investigating the influencing factors in the determination process,the source of uncertainty was analyzed,and each uncertainty component was evaluated.The results showed that the uncertainty introduced by standard solution preparation,constant volume of sample solution transfer and standard curve fitting contributed greatly to the uncertainty of synthetic measurement.When the content of ethyl acetate in light flavor Baijiu is 0.89 g·L-1,the expanded uncertainty is 0.05 g·L-1(k=2).
gas chromatography internal standard methodBaijiuethyl acetateuncertainty
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