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Polarity and oxidation level of visible absorbers in model organic aerosol

Kameel, F. Rifkha and Lee, S. H. and Hoffmann, M. R. and Colussi, A. J. (2014) Polarity and oxidation level of visible absorbers in model organic aerosol. Chemical Physics Letters, 603 . pp. 57-61. ISSN 0009-2614.

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How to parametrize the absorptivity of organic aerosols in atmospheric radiative models remains uncertain. Here we report that the λ = 400 nm absorbers in model aerosol mixtures elute as weakly polar species in reversed-phase chromatography. Typical among them, the m/z = 269 (C_(12)H_(13)O_7^−, O/C = 0.58) isomers detected by mass spectrometry possess C═O groups linked by C═C bridges. More polar species, such as the m/z = 289 (C_(11)H_(13)O_9^−, O/C = 0.82) polyacids, are instead colorless. On this basis we argue that visible absorptivity, which develops from extended conjugation among chromophores, may not increase monotonically with oxidation level.

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Hoffmann, M. R.0000-0001-6495-1946
Colussi, A. J.0000-0002-3400-4101
Additional Information:© 2014 Elsevier B.V. Received 11 February 2014. In final form 18 April 2014. Available online 24 April 2014. This work was supported by NSF (U.S.A.) Grant AC-1238977.
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Record Number:CaltechAUTHORS:20140609-104744673
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Official Citation:F. Rifkha Kameel, S.H. Lee, M.R. Hoffmann, A.J. Colussi, Polarity and oxidation level of visible absorbers in model organic aerosol, Chemical Physics Letters, Volume 603, 30 May 2014, Pages 57-61, ISSN 0009-2614, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46148
Deposited By: Ruth Sustaita
Deposited On:09 Jun 2014 18:05
Last Modified:03 Mar 2020 13:01

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