有機極微量成分分析のための化学イオン化質量分析法の測定条件の検討

概要

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The ion source temperature, ionization chamber pressure and the kind of reagent gas were examined to find the optimum experimental conditions for organic trace analysis by chemical ionization mass spectrometry with a Finnigan 3300E gas chromatograph mass spectrometer. Toluene, dodecane, methyl caplate, and diethyl phthalate were used as the model compounds. The lower ion source temperature, e.g. 70℃, and the ionization chamber pressure of about 1 Torr were suitable to high sensitive and/or selective detections. The quasi-molecular ions, (M±H)^+, were generated more effectively under the above conditions. The influence of reagent gas was studied with methane, water, methyl alcohol, isobutane or ammonia as a reagent gas and phthalic acid esters, butylbenzenes, 2-ethoxyethyl acetate(2-EEA), and 3-methoxybutyl acetate (3-MBA) as samples. The intensities for MH^+ ion of 2-EEA and 3-MBA in isobutane reagent gas, respectively, were 8 and 28 times stronger than those in methane reagent gas.
社団法人日本分析化学会の論文
1984-04-05