Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59579
Type: Artigo de periódico
Title: Photochemical nitro-nitrite rearrangement in methyl parathion decay under tropical conditions
Author: Araujo, TMR
Canela, MC
Miranda, PCML
Abstract: This work presents a study of the abiotic degradation of commercially available methyl parathion in aqueous solution at two different concentrations (88mg/L and 200g/L). The effects of solar irradiation and the presence of humic acids were evaluated and revealed a synergistic response between them. The half-life of methyl parathion ranged from 4.9 to 37days, and the experimental data also show that photochemical processes were the most relevant in this case. The only byproduct found in samples submitted to shadowed conditions was 4-nitrophenol. On the other hand, 4-nitrophenol, methyl paraoxon and a new degradation product (O,O-dimethyl O-p-hydroxyphenyl phosphorothioate) were detected when the samples were exposed directly to sunlight. This newly identified compound was prepared in the laboratory by thiophosphorylation of hydroquinone, and coelution experiments with authentic samples provided unambiguous confirmation of the presence of O,O-dimethyl O-p-hydroxy phenylphosphorothioate in samples.
Subject: Photochemical rearrangements
nitro-nitrite rearrangement
methyl parathion byproduct
mass spectrometry
Country: EUA
Editor: Taylor & Francis Inc
Rights: fechado
Identifier DOI: 10.1080/03601234.2013.743750
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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