HR: 1340h
AN: A33D-1546    [Abstracts]
TI: Characteristics of particulate nitrite and HONO formation in Korea
AU: * Park, M E
EM: mep@gist.ac.kr
AF: Gwangju Institute of Science & Technology (GIST), #1, Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AU: Song, C H
EM: chsong@gist.ac.kr
AF: Gwangju Institute of Science & Technology (GIST), #1, Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AU: Song, C H
EM: chsong@gist.ac.kr
AF: Advanced Environmental Monitoring Research Center(ADEMRC), GIST, #1, Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AU: Lee, E J
EM: kwangnewni@dreamwiz.com
AF: Ajou University, San-#5, Wonchun-dong, Yeongtong-gu, Suwon, 443-749, Korea, Republic of
AU: Han, J S
EM: nierhan@me.go.kr
AF: National Institute of Environmental Research, Kyungsung-dong, Seo-gu, Incheon, 404-708, Korea, Republic of
AU: Moon, K J
EM: chsong@gist.ac.kr
AF: National Institute of Environmental Research, Kyungsung-dong, Seo-gu, Incheon, 404-708, Korea, Republic of
AU: Lee, B K
EM: chsong@gist.ac.kr
AF: Yonsei University, #134 Sinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea, Republic of
AU: Lee, D S
EM: dslee@yonsei.ac.kr
AF: Yonsei University, #134 Sinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea, Republic of
AU: Kondo, Y
EM: chsong@gist.ac.kr
AF: The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8904, Japan
AU: Kim, H S
EM: hskim98@gist.ac.kr
AF: Gwangju Institute of Science & Technology (GIST), #1, Oryong-dong, Buk-gu, Gwangju, 500-712, Korea, Republic of
AB: Continuous and simultaneous measurements of gaseous species (NH₃, HONO, NO₂, HNO₃, and HCl) and particulate inorganic components (NH₄⁺, SO₄^2-, NO₃^-, and NO₂^-) were made in Seoul (urban site; from 6 to 20 May, 2005 and from 23 June to 7 July, 2005) and Gosan (background site; from 17 March to 4 April, 2005), using a Particle-into-Liquid Sampler coupled to a dual channel Ion-Chromatography (PILS-IC) and a denuder-filter pack system (URG Corporation). In both the sites, high levels of nitrous acid (HONO) were observed in the gas-phase, indicating possible active heterogeneous HONO productions at the surface of ambient aerosols. However, particulate nitrite (NO₂^-) concentrations ranging from 0.33 μ g/m³ to 4.66 μ g/m³ were only measured in the Seoul site. In this study, we therefore investigate likely reason of the particulate nitrite formation in Seoul. In Seoul, sufficient alkalinity can be provided into the atmospheric aerosols from NH₃ excessively present in the gas-phase. For example, equivalence ratios of total ammonium to total acidic particulate components in Seoul are by far larger than 1 during the measurement periods, suggesting that particles measured in Seoul are likely in an alkaline condition. Due to the alkaline condition, the HONO molecules produced at the surface of atmospheric aerosols appear to be captured by ammonium (NH₄⁺) inside atmospheric particles, thereby not being able to further participate in the atmospheric O₃/NO_y/HO_x chemical cycles.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting