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Hua, W. [Verfasser:in]; Chen, Z.M. [Verfasser:in]; Wang, H.L. [Verfasser:in]; Zhang, Y. [Verfasser:in]; Hu, M. [Verfasser:in]; Jie, C.Y. [Verfasser:in]; Kondo, Y. [Verfasser:in]; Hofzumahaus, A. [Verfasser:in]; Takegawa, N. [Verfasser:in]; Chang, C.C. [Verfasser:in]; Lu, K. [Verfasser:in]; Miyazaki, Y. [Verfasser:in]; Kita, K. [Verfasser:in]

Atmospheric hydrogen peroxide and organic hydroperoxides during PRIDE-PRD'06, China: their concentration, formation mechanism and contribution to secondary aerosols

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  • Medientyp: E-Artikel
  • Titel: Atmospheric hydrogen peroxide and organic hydroperoxides during PRIDE-PRD'06, China: their concentration, formation mechanism and contribution to secondary aerosols
  • Beteiligte: Hua, W. [Verfasser:in]; Chen, Z.M. [Verfasser:in]; Wang, H.L. [Verfasser:in]; Zhang, Y. [Verfasser:in]; Hu, M. [Verfasser:in]; Jie, C.Y. [Verfasser:in]; Kondo, Y. [Verfasser:in]; Hofzumahaus, A. [Verfasser:in]; Takegawa, N. [Verfasser:in]; Chang, C.C. [Verfasser:in]; Lu, K. [Verfasser:in]; Miyazaki, Y. [Verfasser:in]; Kita, K. [Verfasser:in]
  • Erschienen: EGU, 2008
  • Erschienen in: Atmospheric chemistry and physics 8, 6755 - 6773 (2008). doi:10.5194/acp-8-6755-2008
  • Sprache: Englisch
  • DOI: https://doi.org/10.5194/acp-8-6755-2008
  • ISSN: 1680-7316
  • Schlagwörter:
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  • Anmerkungen: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Beschreibung: Atmospheric hydrogen peroxide (H2O2) and organic hydroperoxides were measured from 18 to 30 July in 2006 during the PRIDE-PRD'06 campaign at Backgarden, a rural site located 48 km north of Guangzhou, a mega-city in southern China. A ground-based instrument was used as a scrubbing coil collector to sample ambient air, followed by on-site analysis by high-performance liquid chromatography (HPLC) coupled with post-column derivatization and fluorescence detection. The H2O2 mixing ratio over the 13 days ranged from below the detection limit to a maximum of 4.6 ppbv, with a mean (and standard deviation) of (1.26 +/- 1.24) ppbv during the daytime (08:00-20:00 LT). Methyl hydroperoxide (MHP), with a maximum of 0.8 ppbv and a mean (and standard deviation) of (0.28 +/- 0.10) ppbv during the daytime, was the dominant organic hydroperoxide. Other organic peroxides, including bis-hydroxymethyl hydroperoxide (BHMP), peroxyacetic acid (PAA), hydroxymethyl hydroperoxide (HMHP), 1-hydroxy-ethyl hydroperoxide (1-HEHP) and ethyl hydroperoxide (EHP), were detected occasionally. The concentration of H2O2 exhibited a pronounced diurnal variation on sunny days, with a peak mixing ratio in the afternoon (12:00-18:00 LT), but lacked an explicit diurnal cycle on cloudy days. Sometimes a second peak mixing ratio of H2O2 was observed during the evening, suggesting that H2O2 was produced by the ozonolysis of alkenes. The diurnal variation profile of MHP was, in general, consistent with that of H2O2. The estimation indicated that in the morning the H2O2 detected was formed mostly through local photochemical activity, with the rest probably attributable to vertical transport. It is notable that relatively high levels of H2O2 and MHP were found in polluted air. The unexpectedly high level of HO2 radicals detected in this region can account for the production of hydroperoxides, while the moderate level of NOx suppressed the formation of hydroperoxides. High concentrations of hydroperoxides were detected in samples of rainwater collected in a ...
  • Zugangsstatus: Freier Zugang