• Asian Journal of Atmospheric Environment
• /
• 제11권4호
• /
• pp.300-312
• /
• 2017

To improve the understanding of secondary organic aerosol (SOA) formation from the photo-oxidation of anthropogenic and biogenic precursors at the regional background station on Baengnyeong Island, Korea, gas phase and aerosol chemistries were investigated using the Proton Transfer Reaction Time of Flight Mass Spectrometer (PTR-ToF-MS) and the Aerodyne High Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS), respectively. HR-ToF-AMS measured fine particles ($PM_1$; diameter of particle matter less than $1{\mu}m$) at a 6-minute time resolution from February to November 2012, while PTR-ToF-MS was deployed during an intensive period from September 21 to 29, 2012. The one-minute time-resolution and high mass resolution (up to $4000m{\Delta}m^{-1}$) data from the PTR-ToF-MS provided the basis for calculations of the concentrations of anthropogenic and biogenic volatile organic compounds (BVOCs) including oxygenated VOCs (OVOCs). The dominant BVOCs from the site are isoprene (0.23 ppb), dimethyl sulphide (DMS, 0.20 ppb), and monoterpenes (0.38 ppb). Toluene (0.45 ppb) and benzene (0.32 ppb) accounted for the majority of anthropogenic VOCs (AVOCs). OVOCs including acetone (3.98 ppb), acetaldehyde (2.67 ppb), acetic acid (1.68 ppb), and formic acid (2.24 ppb) were measured. The OVOCs comprise approximately 75% of total measured VOCs, suggesting the occurrence of strong oxidation processes and/or long-range transported at the site. A strong photochemical aging and oxidation of the atmospheric pollutants were also observed in aerosol measured by HR-ToF-AMS, whereby a high $f_{44}:f_{43}$ value is shown for organic aerosols (OAs); however, relatively low $f_{44}:f_{43}$ values were observed when high concentrations of BVOCs and AVOCs were available, providing evidence of the formation of SOA from VOC precursors at the site. Overall, the results of this study revealed several different SOA formation mechanisms, and new particle formation and particle growth events were identified using the powerful tools scanning mobility particle sizer (SMPS), PTR-ToF-MS, and HR-ToF-AMS.

• Journal of the Korean Wood Science and Technology
• /
• 제35권6호
• /
• pp.83-90
• /
• 2007

본 연구는 목재를 이용하여 축조한 주택에 친환경마감재를 달리하여 조성한 후 실험실의 실내오염물질 방산 저감에 미치는 영향에 대해 검토하고자 하였다. 측정 결과 모든 시험실에서 벤젠, 톨루엔, 에틸벤젠 및 스티렌의 함량이 신축 공동주택의 실내공기질 권고기준치 이하로 나타났다. 실험실 R1-1과 R2-1에서 다른 종류의 벽지를 사용함에 따른 차이를 본 결과, 황토 벽지를 사용한 R1-1에서 상대적으로 높은 자연적인 VOCs (Natural VOCs)값을 얻었으며, 인위적인 VOCs (Anthropogenic VOC) 및 총 VOCs (Total VOCs)의 함량도 높게 나타났다. 실험실 R1-2와 R2-2에서 대나무숯 패널의 유무에 따른 방산특성을 비교한 결과 대나무숯 패널을 설치한 시험실에서 AVOC 함량이 높게 나타났는데 이것은 패널부착 시 사용된 접착제에 일부 영향을 받은 것으로 판단된다. 시험실 R1-3(거실)은 나머지 4곳의 시험실(침실)에 비해 낮은 TVOC 함량을 나타내었고, 다른 시험실과 비교하였을 때 TVOC에 대한 NVOC의 구성비륭이 높은 것으로 보아 마감자재로 사용한 편백의 영향을 받은 것으로 판단된다.