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Kinetic studies of the reaction between pesticides and hydroxyl radical generated by laser flash photolysis.
Gozzi, Fábio; Oliveira, Silvio C; Dantas, Renato F; Silva, Volnir O; Quina, Frank H; Machulek, Amilcar.
Afiliação
  • Gozzi F; Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil.
  • Oliveira SC; Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil.
  • Dantas RF; School of Technology, University of Campinas UNICAMP, Paschoal Marmo 188, 13484-332, Limeira, SP, Brazil.
  • Silva VO; Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil.
  • Quina FH; Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil.
  • Machulek A; Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil.
J Sci Food Agric ; 96(5): 1580-4, 2016 Mar 30.
Article em En | MEDLINE | ID: mdl-25974279
BACKGROUND: Due to contamination of the environment by pesticides and their mishandling, there is the need for treatment of contaminated sites and correct disposal of materials containing them. Thus, studies with advanced oxidation processes are expanding and can determine the rate constant of the hydroxyl radical with organic compounds of great importance in environmental contamination. In this context, the use of laser flash photolysis has been shown to be viable for the determination of these constants. RESULTS: The reaction rate constants of different pesticides with HO(•) in degassed acetonitrile have been determined. They were 1.6 × 10(9) M(-1) s(-1), 0.6 × 10(9) M(-1) s(-1), 1.2 × 10(9) M(-1) s(-1), 2.4 × 10(9) M(-1) s(-1) and 2.2 × 10(9) M(-1) s(-1) for the pesticides carbaryl, propoxur, fenoxycarb, ethoxysulfuron and chlorimuron-ethyl, respectively. These values are about an order of magnitude smaller than the diffusion controlled rate and correlate with the relative rates of disappearance of the pesticides in the photo-Fenton reaction in water. CONCLUSION: The correlation of the relative rate constants determined by laser flash photolysis with the relative rates of photo-Fenton degradation of the pesticides is compelling evidence for the participation of the hydroxyl radical in the degradation of these pesticides in the latter system.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Praguicidas / Fotólise / Radical Hidroxila / Lasers Idioma: En Revista: J Sci Food Agric Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Praguicidas / Fotólise / Radical Hidroxila / Lasers Idioma: En Revista: J Sci Food Agric Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido