Atmos. Chem. Phys. Discuss., 13, 15949-15991, 2013
www.atmos-chem-phys-discuss.net/13/15949/2013/
doi:10.5194/acpd-13-15949-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Structure-activity relationship for the estimation of OH-oxidation rate constants of carbonyl compounds in the aqueous phase
J. F. Doussin1,2 and A. Monod3
1Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR7583, CNRS – Université Paris-Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace (IPSL), Créteil, France
2University of Colorado, CIRES, Boulder, CO 80309, USA
3Aix Marseille Université, CNRS, LCE, FRE 3416, 13331, Marseille, France

Abstract. In the atmosphere, one important class of reactions occurs in the aqueous phase in which organic compounds are known to undertake oxidation towards a number of radicals, among which OH radicals are the most reactive oxidants. In 2008, Monod and Doussin have proposed a new structure activity relationship (SAR) to calculate OH-oxidation rate constants in the aqueous phase. This estimation method is based on the group-additivity principle and was until now limited to alkanes, alcohols, acids, bases and related polyfunctional compounds. In this work, the initial SAR is extended to carbonyl compounds, including aldehydes, ketones, dicarbonyls, hydroxy-carbonyls, acidic carbonyls, their conjugated bases, and the hydrated form of all these compounds. To do so, only five descriptors have been added and none of the previously attributed descriptors were modified. This extension leads now to a SAR which is based on a database of 102 distinct compounds for which 252 experimental kinetic rate constants have been gathered and reviewed. The efficiency of this updated SAR is such that 58% of the rate constants could be calculated within ±20% of the experimental data and 76% within ±40%.

Citation: Doussin, J. F. and Monod, A.: Structure-activity relationship for the estimation of OH-oxidation rate constants of carbonyl compounds in the aqueous phase, Atmos. Chem. Phys. Discuss., 13, 15949-15991, doi:10.5194/acpd-13-15949-2013, 2013.
 
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