Abstract
n-Dodecane, n-hexadecane, n-nonadecane, n-eicosane and n-docosane were photo-oxidized in purified and sterilized natural sea water under simulated environmental conditions with anthraquinone as sensitizer. GC and GCMS analyses show the production of all isomeric ketones and alcohols with the same number of carbon atoms as the starting alkane and the formation of minor photoproducts: methylketones, 1-alkenes, 3-substituted-γ-lactones, 1,2-epoxy-alkanes, carboxylic acids, 1,2-disubstituted cyclobutanols, γ-keto-2-alcohols, n-aldehydes, γ-diketones and alkanes. Mechanisms are proposed adn discussed. A generalization of the photo-oxidation degradation pathways of n-alkanes in the marine environment is proposed using these results and some previous works.
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