Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Development of Real-time and Simultaneous Quantification of Volatile Organic Compounds in Ambient with SIFT-MS (Selected Ion Flow Tube-Mass Spectrometry)

선택적다중이온질량분석기를 이용한 대기 중 휘발성유기화합물 실시간 동시분석법 개발 및 적용

  • Son, Hyun Dong (Oil and POPs research group, Korea Institute of Ocean Science and Technology) ;
  • An, Joon Geon (Oil and POPs research group, Korea Institute of Ocean Science and Technology) ;
  • Ha, Sung Yong (Oil and POPs research group, Korea Institute of Ocean Science and Technology) ;
  • Kim, Gi Beum (Department of Marine Environmental Engineering, Gyeongsang National University) ;
  • Yim, Un Hyuk (Oil and POPs research group, Korea Institute of Ocean Science and Technology)
  • 손현동 (한국해양과학기술원 남해특성연구센터) ;
  • 안준건 (한국해양과학기술원 남해특성연구센터) ;
  • 하성용 (한국해양과학기술원 남해특성연구센터) ;
  • 김기범 (경상대학교 해양환경공학과) ;
  • 임운혁 (한국해양과학기술원 남해특성연구센터)
  • Received : 2018.02.28
  • Accepted : 2018.04.06
  • Published : 2018.06.30
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Abstract

Volatile organic compounds (VOCs) are representative air pollutants due to their detrimental effects on human health and their role in formation of secondary organic aerosols. Assessments and monitoring programs of VOCs using periodic grab sampling like Tedlar bags, canisters, and sorbent traps provide limited information, often with delay times of days or weeks. Selected ion flow tube mass spectrometry (SIFT-MS) is an emerging analytical technique for the real-time quantification of VOCs in air. It relies on chemical ionization of the VOCs molecules in air introduced into helium carrier gas using $H_3O^+$, $NO^+$, and $O_2{^+}$ precursor ions. Real-time monitoring method of 60 VOCs in the ambient air was developed using TO-15 standard gas mixture. Calibration curves, method detection limit, and quantitation reproducibility of the target compounds were tested. Dynamic dilution system was used to dilute standard gas from 0.174 ppbv to 100 ppbv, where calibration curves showed good linearity with $r^2$> 0.95 in all target analytes. Limit of detection (LOD) all compounds were sub ppbv, and some halogenated compounds showed pptv levels. Seven consecutive analyses of target compounds showed good repeatability with relative standard deviation of less than 10%. One day monitoring of VOCs in ambient air was conducted in Geoje. Average concentration of target VOCs in Geoje were relatively lower than other regions, among which formaldehyde showed the highest concentration ($15.4{\pm}5.78ppbv$). SIFT-MS provided good temporal resolution data (1 data per 3.2 minute), which can be used for identifying ephemeral short-term event. It is expected that SIFT-MS will be a versatile monitoring platform for VOCs in ambient air.

Keywords

References

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