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Leaching of oxadyxil and tebuconazole in Colombian soil.
Aldana, M; De Prado, R; Martínez, M J.
Afiliação
  • Aldana M; Universidad Nacional de Colombia, Departamento de Química, Sede Bogotá, Colombia. mialdanac@unal.edu.co
Commun Agric Appl Biol Sci ; 76(4): 909-14, 2011.
Article em En | MEDLINE | ID: mdl-22702207
Lake Tota (Boyaca, Colombia) supplies water for human consumption, agriculture and industry for more than 500.000 people. Oxadixyl and Tebuconazole are fungicides used in onion crops in the lake catchment area. The mobility of pesticides in soil, bioavailability and transfer to other environmental compartments depend on sorption and desorption kinetics and mechanisms. An understanding of these processes is essential for transport modeling and the rational design of corrective measures against pollution. A displacement study was performed on a hand packed soil column in laboratory conditions. A pulse of 0,01 M CaCl2 solution, containing a tracer (Bromide) and the fungicides Oxadixyl y Tebuconazole, was injected. Column experiment was performed at 0.078 cmh(-1) flow rate under unsaturated conditions. Eluates were collected in flasks at constant intervals and the volumes of eluate were recorded. After rainfall simulation, the soil from the column was sliced into six successive sections (5 cm). Methanol extraction was used to determine the fungicide in each soil section. Samples were measured by HPLC. Only Oxadixyl was recovered in leachates. Unlike bromide breakthrough curve, Oxadixyl was asymmetrical, with early breakthrough and increased tailing. The percentage eluted was 96.7% after ten pore volumes. Tebuconazole showed the highest retention in the first five cm of soil layer. The results suggest that oxadyxil presents highs risk to leachate through the soil profile and that Tebuconazole is strongly absorbed in Colombian soil.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oxazóis / Triazóis / Poluentes Químicos da Água / Fungicidas Industriais / Acetamidas País/Região como assunto: America do sul / Colombia Idioma: En Revista: Commun Agric Appl Biol Sci Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2011 Tipo de documento: Article País de afiliação: Colômbia País de publicação: Bélgica
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oxazóis / Triazóis / Poluentes Químicos da Água / Fungicidas Industriais / Acetamidas País/Região como assunto: America do sul / Colombia Idioma: En Revista: Commun Agric Appl Biol Sci Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2011 Tipo de documento: Article País de afiliação: Colômbia País de publicação: Bélgica