Authors:	Kampf, Christopher Johannes Jakob, Ronit Hoffmann, Thorsten
Title:	Identification and characterization of aging products in the glyoxal/ammonium sulfate system : implications for light-absorbing material in atmospheric aerosols
Online publication date:	13-Jul-2022
Year of first publication:	2012
Language:	english
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:	540 Chemie 540 Chemistry and allied sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7399
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/3.0/
Journal:	Atmospheric chemistry and physics 12 14
Pages or article number:	6323 6333
Publisher:	European Geosciences Union
Publisher place:	Katlenburg-Lindau
Issue date:	2012
ISSN:	1680-7324 1680-7316
Publisher URL:	http://dx.doi.org/10.5194/acp-12-6323-2012
Publisher DOI:	10.5194/acp-12-6323-2012
Appears in collections:	DFG-OA-Publizieren (2012 - 2017)