大気圧イオン化質量分析法による室内空気中微量アセトンの定量

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Determination of trace amounts of acetone at (sub-ppm level) in air by atmospheric pressure ionization mass spectrometry (API-MS) was studied. Air samples were directly introduced to the ion source of the instrument without pre-concentration. This technique (positive mode) is also used for real-time analysis of air samples with rapid scanning, and has been shown to be highly sensitive for acetone (at sub-ppm levels). The peaks at m/z 19,37,55,73,91,corresponded to protonated water clusters of (H_2O)H^+, (H^2O)_2H^+, (H_2O)_3H^+, (H_2O)_4H^+, and (H_2O)_5H^+, respectively. The peak at m/z 47 was due to (C_2H_5OH)H^+, and that at 59 due to ((CH_3)_2CO)H^+ (acetone). They showed good repeatability with a relative standard deviation of less than about 5%. The API-MS voltage response produced a straight line in the approximate range 0.01 to 0.1 ppm of acetone in air.(Received April 5,1995)(Accepted August 2,1995)
社団法人日本分析化学会の論文
1995-12-05