Multiphase chemistry of glyoxal: Revised kinetics of the alkyl radical reaction with molecular oxygen and the reaction of glyoxal with OH, NO3 and SO4(-) in aqueous solution. Schaefer, T., van Pinxteren, D., & Herrmann, H. Environmental science & technology, 12, 2014.
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Paper Website abstract bibtex The rate constant for the reaction of the hydrated glyoxyl radical (CH(OH)2-C(OH)2· with O2 has been determined as k298 K = (1.2 ± 0.3) × 10(9) l mol(-1) s(-1) at pH = 4.8. This experimental value is considerably higher than a widely used estimated value of about k = 1 × 10(6) l mol(-1) s(-1). As the aqueous phase conversion of glyoxal is of wide interest for aqSOA formation, we suggest that the newly determined rate constant should be applied in multiphase models. The formation of the dimerization product tartaric acid has as well been studied. This product is found, however in significant yields only when the oxygen content of the solution is reduced. The formation of dimers from the recombination of alkyl radicals in the atmospheric aqueous phase should hence be treated with great care. Finally, the reactions of the free radicals OH, NO3 and SO4(-) with glyoxal have been investigated and rate constants of k298 K (OH) = (9.2 ± 0.5) × 10(8) l mol(-1) s(-1), k298 K (SO4(-)) = (2.4 ± 0.2) × 10(7) l mol(-1) s(-1) and k298 K (NO3) = (4.5 ± 0.3) × 10(6) l mol(-1) s(-1) were obtained.
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title = {Multiphase chemistry of glyoxal: Revised kinetics of the alkyl radical reaction with molecular oxygen and the reaction of glyoxal with OH, NO3 and SO4(-) in aqueous solution.},
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abstract = {The rate constant for the reaction of the hydrated glyoxyl radical (CH(OH)2-C(OH)2· with O2 has been determined as k298 K = (1.2 ± 0.3) × 10(9) l mol(-1) s(-1) at pH = 4.8. This experimental value is considerably higher than a widely used estimated value of about k = 1 × 10(6) l mol(-1) s(-1). As the aqueous phase conversion of glyoxal is of wide interest for aqSOA formation, we suggest that the newly determined rate constant should be applied in multiphase models. The formation of the dimerization product tartaric acid has as well been studied. This product is found, however in significant yields only when the oxygen content of the solution is reduced. The formation of dimers from the recombination of alkyl radicals in the atmospheric aqueous phase should hence be treated with great care. Finally, the reactions of the free radicals OH, NO3 and SO4(-) with glyoxal have been investigated and rate constants of k298 K (OH) = (9.2 ± 0.5) × 10(8) l mol(-1) s(-1), k298 K (SO4(-)) = (2.4 ± 0.2) × 10(7) l mol(-1) s(-1) and k298 K (NO3) = (4.5 ± 0.3) × 10(6) l mol(-1) s(-1) were obtained.},
bibtype = {article},
author = {Schaefer, Thomas and van Pinxteren, Dominik and Herrmann, Hartmut},
journal = {Environmental science & technology}
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This experimental value is considerably higher than a widely used estimated value of about k = 1 × 10(6) l mol(-1) s(-1). As the aqueous phase conversion of glyoxal is of wide interest for aqSOA formation, we suggest that the newly determined rate constant should be applied in multiphase models. The formation of the dimerization product tartaric acid has as well been studied. This product is found, however in significant yields only when the oxygen content of the solution is reduced. The formation of dimers from the recombination of alkyl radicals in the atmospheric aqueous phase should hence be treated with great care. Finally, the reactions of the free radicals OH, NO3 and SO4(-) with glyoxal have been investigated and rate constants of k298 K (OH) = (9.2 ± 0.5) × 10(8) l mol(-1) s(-1), k298 K (SO4(-)) = (2.4 ± 0.2) × 10(7) l mol(-1) s(-1) and k298 K (NO3) = (4.5 ± 0.3) × 10(6) l mol(-1) s(-1) were obtained.","bibtype":"article","author":"Schaefer, Thomas and van Pinxteren, Dominik and Herrmann, Hartmut","journal":"Environmental science & technology","bibtex":"@article{\n title = {Multiphase chemistry of glyoxal: Revised kinetics of the alkyl radical reaction with molecular oxygen and the reaction of glyoxal with OH, NO3 and SO4(-) in aqueous solution.},\n type = {article},\n year = {2014},\n identifiers = {[object Object]},\n websites = {http://www.ncbi.nlm.nih.gov/pubmed/25478901},\n month = {12},\n day = {5},\n id = {cf58417e-7393-3fe0-ab6e-ecdc758c17bc},\n created = {2015-01-17T06:16:27.000Z},\n accessed = {2014-12-08},\n file_attached = {true},\n profile_id = {20dfd46a-aca3-3bc6-a8b4-f2c5cd8fb12d},\n group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},\n last_modified = {2015-01-30T05:01:45.000Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n abstract = {The rate constant for the reaction of the hydrated glyoxyl radical (CH(OH)2-C(OH)2· with O2 has been determined as k298 K = (1.2 ± 0.3) × 10(9) l mol(-1) s(-1) at pH = 4.8. 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