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      • Direct Analysis of Volatile Organic Compounds by Time-of-Flight Mass Spectrometry Using Soft Plasma Ionization

        ( Yoko Nunome ),( Hyun Kook Park ),( Kenji Kodama ),( Yasuaki Ueki ),( Ryo Yoshiie ),( Sang Chun Lee ),( Kuniyuki Kitagawa ),( Ichiro Naruse ) 경남대학교 신소재연구소 2013 신소재연구 Vol.25 No.-

        Toxic volatile organic compounds (VOCs) have serious implications for the environment and human health. An analytical method for the rapid, direct detection of VOCs without any sample pretreatment was successfully developed by combining soft plasma ionization (SPI) with time-of-flight mass spectrometry (TOFMS). The SPI source, based on Ref. 1 and re-designed for this work, is shown schematically in Fig. 1. Vapor from a liquid sample was diluted to a ratio selected in accordance with the amount of ambient air. To achieve softer ionization of VOCs by the SPI method, discharge parameters (current and pressure) were varied to determine the optimal experimental conditions. Use of ambient air as the discharge gas was the aim for practical in situ analysis. Optimal conditions for the SPI source were determined to be: sample dilution ratio, R = 0.30; discharge current, 50 mA; and ambient air pressure, 1000 Pa. All mass spectra of the the organic solvents exhibited molecular ion base peaks, which demonstrated the achievement of soft ionization by the SPI method. From these results, an ionization mechanism in the SPI-TOFMS system was suggested in which excitation of N2 would facilitate the ionization of sample molecules. It is noteworthy that the SPI-TOFMS system enabled highly soft ionization by using practical ambient air as the discharge gas rather than cylinder gas. Therefore, this SPI-TOFMS system was validated and was well suited for the in situ on-line monitoring of VOCs. Further work will be necessary to evaluate quantification methods for the accuracy and reproducibility of our measurements.

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