Autoren:	Kampf, Christopher Johannes Jakob, Ronit Hoffmann, Thorsten
Titel:	Identification and characterization of aging products in the glyoxal/ammonium sulfate system : implications for light-absorbing material in atmospheric aerosols
Online-Publikationsdatum:	13-Jul-2022
Erscheinungsdatum:	2012
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	In this study we report the identification of bicyclic imidazoles in aqueous aerosol mimics using HPLC-ESI-MS/MS. 2,2'-Biimidazole was identified to be a major contributor to the 280 nm absorbance band observed in mixtures of glyoxal and ammonium sulfate, despite the fact that its production rate is two orders of magnitude lower than the previously reported production rates of imidazole or imidazole-2-carboxaldehyde. The molar absorptivity of 2,2'-biimidazole was determined to be (36 690 ± 998) M<sup>-1</sup> cm<sup>-1</sup>. This demonstrates the necessity of molecular product identification at trace levels to enable a better understanding of relevant absorbing species. Additionally, the formation of lower polarity products including formamides of imidazoles is proposed. The role of imidazoles and other light-absorbing species in the formation of SOA and optical properties of SOA is discussed and potentially interesting fields for future investigations are outlined.
DDC-Sachgruppe:	540 Chemie 540 Chemistry and allied sciences
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 09 Chemie, Pharmazie u. Geowissensch.
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7399
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/3.0/
Zeitschrift:	Atmospheric chemistry and physics 12 14
Seitenzahl oder Artikelnummer:	6323 6333
Verlag:	European Geosciences Union
Verlagsort:	Katlenburg-Lindau
Erscheinungsdatum:	2012
ISSN:	1680-7324 1680-7316
URL der Originalveröffentlichung:	http://dx.doi.org/10.5194/acp-12-6323-2012
DOI der Originalveröffentlichung:	10.5194/acp-12-6323-2012
Enthalten in den Sammlungen:	DFG-OA-Publizieren (2012 - 2017)