A mixture of four substances of benzaldehyde ,iso-octane ,butyl acetate ,acetophenone were quantitatively analyzed by mass spectrometry combined with chemometrics .The mass chromatogram data of mixture were proceeded with two methods for quantitative analysis .One is feature selection-Multiple Linear Regression (MLR) and the other is full spectrum- Partial Least Squares (PLS) .The results show that the RMSEP of benzaldehyde were 0.062 and 0.091 after selecting m/z spectrum and full spectrum respectively ;RMSEP of isooctane were 0 .048 and 0 .057 after selecting spectrum and full spectrum respectively ;which of butyl acetate were 0.021 and 0.020 and of acetophenone were 0.010 and 0.032 .The feature selection results of the mixture were better than that of the full spectrum modeling results expect butyl acetate which got similar results by the two methods .%质谱法和化学计量学方法相结合对混合物中苯甲醛 ,异辛烷 ,乙酸丁酯 ,苯乙酮四种物质进行定量分析.将混合物的质量色谱图数据分别用特征选择 -多元线性回归(MLR)和全谱 -偏最小二乘法(PLS)这两种方法对四种物质进行定量分析.苯甲醛特征选择和全谱建模的RMSEP分别为0.062和0.091 ;异辛烷特征选择和全谱建模的 RMSEP分别为0.048和0.057;乙酸丁酯特征选择和全谱建模的 RMSEP分别为0.021和0.020 ;苯乙酮特征选择和全谱建模的RMSEP分别为0.010和0.032.结果表明苯甲醛 ,异辛烷 ,苯乙酮特征选择的结果均优于全谱建模的结果 ,乙酸丁酯特征选择的结果和全谱建模的结果相近.
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