Possible particulate nitrite formation and its atmospheric implications inferred from the observations in Seoul, Korea

Chul H. Song, Mi E. Park, En J. Lee, Jae H. Lee, Bo K. Lee, Dong Soo Lee, Jhoon Kim, Jin S. Han, Kwang J. Moon, Yutaka Kondo

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Abstract

Simultaneous measurements of gaseous species and fine-mode, particulate inorganic components were performed at the University of Seoul, Seoul in Korea. In the simultaneous measurements, a certain level of nitrous acid (HONO) was observed in the gas-phase, indicating possible heterogeneous HONO production on the surface of the ambient aerosols. On the other hand, high particulate nitrite (NO 2- ) concentrations of 1.41(±2.26) μg/m 3 were also measured, which sometimes reached 18.54 μg/m 3 . In contrast, low HONO-to-NO 2 ratios of 0.007(±0.006) were observed in Seoul. This indicates that a significant fraction of HONO is dissolved in atmospheric aerosols. Around the Seoul site, sufficient alkalinity may have been provided to the atmospheric aerosols from the excessive presence of NH 3 in the gas-phase. Due to the alkaline particulate conditions (defined in this study as a particle pH >∼3.29), the HONO molecules produced at the surface of the atmospheric aerosols appeared to have been converted into particulate nitrite, thereby preventing their further participation in the atmospheric O 3 /NO y /HO x photochemical cycles. It was estimated that a minimum average of 65% of HONO was captured by alkaline, anthropogenic, urban particles in the Seoul measurements.

Original languageEnglish
Pages (from-to)2168-2173
Number of pages6
JournalAtmospheric Environment
Volume43
Issue number13
DOIs
Publication statusPublished - 2009 Apr 1

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nitrite
aerosol
gas
alkalinity
acid
particle

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

Cite this

Song, Chul H. ; Park, Mi E. ; Lee, En J. ; Lee, Jae H. ; Lee, Bo K. ; Lee, Dong Soo ; Kim, Jhoon ; Han, Jin S. ; Moon, Kwang J. ; Kondo, Yutaka. / Possible particulate nitrite formation and its atmospheric implications inferred from the observations in Seoul, Korea. In: Atmospheric Environment. 2009 ; Vol. 43, No. 13. pp. 2168-2173.
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abstract = "Simultaneous measurements of gaseous species and fine-mode, particulate inorganic components were performed at the University of Seoul, Seoul in Korea. In the simultaneous measurements, a certain level of nitrous acid (HONO) was observed in the gas-phase, indicating possible heterogeneous HONO production on the surface of the ambient aerosols. On the other hand, high particulate nitrite (NO 2- ) concentrations of 1.41(±2.26) μg/m 3 were also measured, which sometimes reached 18.54 μg/m 3 . In contrast, low HONO-to-NO 2 ratios of 0.007(±0.006) were observed in Seoul. This indicates that a significant fraction of HONO is dissolved in atmospheric aerosols. Around the Seoul site, sufficient alkalinity may have been provided to the atmospheric aerosols from the excessive presence of NH 3 in the gas-phase. Due to the alkaline particulate conditions (defined in this study as a particle pH >∼3.29), the HONO molecules produced at the surface of the atmospheric aerosols appeared to have been converted into particulate nitrite, thereby preventing their further participation in the atmospheric O 3 /NO y /HO x photochemical cycles. It was estimated that a minimum average of 65{\%} of HONO was captured by alkaline, anthropogenic, urban particles in the Seoul measurements.",
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Possible particulate nitrite formation and its atmospheric implications inferred from the observations in Seoul, Korea. / Song, Chul H.; Park, Mi E.; Lee, En J.; Lee, Jae H.; Lee, Bo K.; Lee, Dong Soo; Kim, Jhoon; Han, Jin S.; Moon, Kwang J.; Kondo, Yutaka.

In: Atmospheric Environment, Vol. 43, No. 13, 01.04.2009, p. 2168-2173.

Research output: Contribution to journalArticle

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