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Aminocyclopyrachlor sorption-desorption and leaching from three Brazilian soils.
Francisco, Jeane G; Mendes, Kassio F; Pimpinato, Rodrigo F; Tornisielo, Valdemar L; Guimarães, Ana C D.
Afiliação
  • Francisco JG; a Center of Nuclear Energy in Agriculture , University of São Paulo , Piracicaba , SP , Brazil.
  • Mendes KF; a Center of Nuclear Energy in Agriculture , University of São Paulo , Piracicaba , SP , Brazil.
  • Pimpinato RF; a Center of Nuclear Energy in Agriculture , University of São Paulo , Piracicaba , SP , Brazil.
  • Tornisielo VL; a Center of Nuclear Energy in Agriculture , University of São Paulo , Piracicaba , SP , Brazil.
  • Guimarães ACD; b Department of Agronomy , University of Mato Grosso State , Alta Floresta , MT , Brazil.
J Environ Sci Health B ; 52(7): 470-475, 2017 Jul 03.
Article em En | MEDLINE | ID: mdl-28353389
This study aimed to evaluate the sorption-desorption and leaching of aminocyclopyrachlor from three Brazilian soils. The sorption-desorption of 14C-aminocyclopyrachlor was evaluated using the batch method and leaching was assessed in glass columns. The Freundlich model showed an adequate fit for the sorption-desorption of aminocyclopyrachlor. The Freundlich sorption coefficient [Kf (sorption)] ranged from 0.37 to 1.34 µmol (1-1/n) L1/n kg-1 and showed a significant positive correlation with the clay content of the soil, while the Kf (desorption) ranged from 3.62 to 5.36 µmol (1-1/n) L1/n kg-1. The Kf (desorption) values were higher than their respective Kf (sorption), indicating that aminocyclopyrachlor sorption is reversible, and the fate of this herbicide in the environment can be affected by leaching. Aminocyclopyrachlor was detected at all depths (0-30 cm) in all the studied soils, where leaching was influenced by soil texture. The total herbicide leaching from the sandy clay and clay soils was <0.06%, whereas, ∼3% leached from the loamy sand soil. The results suggest that aminocyclopyrachlor has a high potential of leaching, based on its low sorption and high desorption capacities. Therefore, this herbicide can easily contaminate underground water resources.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Pirimidinas / Poluentes do Solo País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Environ Sci Health B Ano de publicação: 2017 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: Pirimidinas / Poluentes do Solo País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Environ Sci Health B Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido