INIFTA 05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Kinetics of the sulfate radical-mediated photo-oxidation of humic substances.
Autor/es:
PEDRO M. DAVID GARA; GABRIELA N. BOSIO; MÓNICA C. GONZALEZ; DANIEL O. MÁRTIRE
Revista:
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
Editorial:
Wiley InterScience
Referencias:
Año: 2007 vol. 40 p. 41 - 49
ISSN:
0538-8066
Resumen:
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 flashphotolysis.
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.−(36 ± 11) kJ mol−1.
