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RISS 인기검색어
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- 저자 : Takumi Oda (검색결과 1 건)
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Simultaneous Sampling of NO, NO2, HONO and HNO3 in the Atmosphere by a Filter-Pack Method
Norimichi Takenaka,Takumi Oda,Yusuke Fujii 한국대기환경학회 2022 Asian Journal of Atmospheric Environment (AJAE) Vol.16 No.2
A simultaneous sampling method for gaseous nitric oxide (NO), nitrogen dioxide (NO2), nitrous acid (HONO) and nitric acid (HNO3) was developed by a filter-pack sampling method to measure these concentrations at low cost in areas where monitoring stations are not available or at multiple locations. HONO and HNO3 gases were collected with a conventional filter-pack method. NO2 was collected with a guaiacolimpregnated filter at a flow rate of 0.3 dm3 min-1. NO was collected using guaiacol by oxidizing it to NO2 with potassium permanganate at a 0.3 dm3 min-1 flow rate. The optimum concentration of KMnO4 in the immersion solution for the impregnated filter was 0.16 mol dm-3 (in 0.51 mol dm-3 H2SO4). The concentrations of NO and NO2 measured by the filter-pack method were in good agreement with those measured by the chemiluminescence method. It was calculated that 60 ppb NO could be oxidized to NO2 with the KMnO4-impregnated filter for 183 hours at a 0.3 dm3 min-1 flow rate. This is enough time for sampling in a real environment. This method was applied to measure NO, NO2, HONO and HNO3 in the atmosphere at three points around Osaka, Japan.
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