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Published May 30, 2014 | Supplemental Material
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Polarity and oxidation level of visible absorbers in model organic aerosol


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.

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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