用气相色谱法测定酒类产品中挥发性成分的“乙醇内标法”
Method "Ethanol as Internal Standard" for determination of volatile compounds in alcohol products by gas chromatography in daily practice
摘要：
本文对近年来提出的“乙醇内标法”气相色谱法测定酒精类产品中挥发性成分的新方法进行了研究，包括对干邑白兰地、白兰地等标准溶液、不同乙醇水溶液和标准物质CRM LGC 5100威士忌同系物的方法验证。对四个不同实验室的实验研究结果进行分析，结果表明，根据拟定方法计算的实验测量浓度与所有分析化合物在重量法制备期间指定的浓度值之间的相对偏倚不超过10%。结果表明，分析的挥发性化合物和乙醇之间的相对响应因子（RRF）不依赖于分析时间，是恒定的，为每个模型的GC。它示出的可能性，使用预定的RRF在日常实践中的测试实验室，并实施这种新的方法在国际标准的测量程序。
英文摘要：
Recently proposed new method "Ethanol as Internal Standard" for determination of volatile compounds in alcohol products by gas chromatography (GC) is investigated from different sides including method testing on prepared standard solutions like cognac and brandy, different ethanol-water solutions and certified reference material CRM LGC5100 Whisky-Congeners. Analysis of obtained results of experimental study from four different laboratories shows that relative bias between the experimentally measured concentrations calculated in accordance with proposed method and the values of concentrations assigned during the preparation by gravimetric method for all analyzed compounds does not exceed 10 %. It is shown that relative response factors (RRF) between analyzed volatile compounds and ethanol do not depend on time of analysis and are constant for every model of GC. It is shown the possibility to use predetermined RRF in daily practice of testing laboratories and to implement this new method in the international standards of measurement procedure.
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