A gas chromatography-fourier transform infrared spectroscopy (GC-FTIR) method for the determination of three aldehydes fragrances (acetaldehyde,valeraldehyde and 2-methylbutanal) in spirit was developed.The sample was injected directly and analyzed by GC-FTIR.The calibration curves showed good linearity in the concentration range of 10-10 000 mg/L and the correlation coefficient was more than 0.998.The limit of detection was 10 mg/L,and the recoveries of spiked sample were more than 90％.The method can improve the accuracy of qualitative and quantitative analysis,especially the ability to distinguish isomers with characteristic IR spectra of various components.%建立了气相色谱-红外光谱联用法测定白酒中乙醛、戊醛、异戊醛3种醛类挥发性香料成分的方法.白酒样品直接进样分析,在10～10 000 mg/L范围内,3种醛类的色谱峰面积与质量浓度线性相关,相关系数大于0.998,方法的检出限为10 mg/L,加标回收率大于90％.利用各个组分的特征红外谱图,提高了分析定性和定量的准确性,特别是提高了对同分异构体的区分能力.
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