化学イオン化質量分析法によるC8H10，C9H12アルキルベンゼン異性体の判別と同定

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The CI mass spectra of C8H10 and C9H12 alkylbenzene possessing four and eight isomers respectively, were evaluated for the the purpose of their isomeric distinction and identification. About 2μg of each isomer in acetone was introduced into a Finnigan 3300E GC/QMS system equipped with an OV-1 or Squalane column. The ion source conditions were CH4 (1 Torr), i-C4H10 (0.5 Torr) at 70°C. The relative standard deviation was 1~10% for thrice repeated measurements and also 1~20% on another day. In CH4 reagent gas, (M-27)+ peak only appeared in ethylbenzene and ethyltoluene, while C3H7+, (M-41)+ and (M-13)+ was only given by propylbenzene. Since there was a considerable difference in the intensity ratio of (M-15)+, (M-1)+, M+ or (M+57)+ to (M+1)+ when using i-C4H10 as reagent gas, distinction of isomers among each alkylbenzene was possible. It was found that the CI mass spectra using CH4 reagent gas were advantageous for grouping C8H10 and C9H12 isomers, whereas those using i-C4H10 reagent gas were suitable in distincting and identifying each isomer. The CI method was superior to EI method concerning this study.
日本質量分析学会の論文