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Photolytic and Radiolytic Oxidation of Humic Acid †
Author(s) -
Martin Marcela V.,
Ruiz Gustavo T.,
Gonzalez Mónica C.,
Borsarelli Claudio D.,
Mártire Daniel O.
Publication year - 2012
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2012.01116.x
Subject(s) - radiolysis , radical , chemistry , humic acid , bromide , flash photolysis , photochemistry , absorbance , bromine , reaction rate constant , photodissociation , ion , inorganic chemistry , kinetics , organic chemistry , chromatography , fertilizer , physics , quantum mechanics
The reactions of Br 2 ˙ − , Br˙, HO˙ and N 3 ˙ with Aldrich humic acid (AHA) were investigated. The Br/Br 2 ˙ − radicals were obtained in flash‐photolysis experiments (λ exc = 266 nm) performed with NaS 2 O 8 solutions in the presence of bromide ions. HO˙and N 3 ˙ radicals were generated by pulse radiolysis of N 2 O‐saturated solutions. From the combination of a bilinear analysis and computer simulations of the absorbance traces, it was possible to obtain information on the rate constants for the reactions of Br 2 ˙ − , Br˙, HO˙ and N 3 ˙ with AHA and on the intermediate species involved in the mechanism. Evidence for the participation of phenoxyl radicals (λ max = 410 nm) is given.