Kinetics of the sulfate radical‐mediated photo‐oxidation of humic substances |
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| Authors: | Pedro M. David Gara Gabriela N. Bosio Mónica C. Gonzalez Daniel O. Mártire |
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| Affiliation: | Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 16, Suc. 4, (1900) La Plata, Argentina |
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| Abstract: | The kinetics of the aqueous phase reaction of sulfate radicals with commercial humic acids and with organic matter extracted from vermicompost (VC) was studied by flash‐photolysis. The results can be interpreted by a mechanism that in a first step considers the reversible binding of the sulfate radicals by the humic substances. Both the bound and free sulfate radicals decay to oxidized products. From experiments performed with Aldrich humic acids in the temperature range from 283 to 303 K, the enthalpy change associated with the binding process was estimated to be ?(36 ± 11) kJ mol?1. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 40: 19–24, 2008 |
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