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Determination of pesticides in lettuce using solid-liquid extraction with low temperature partitioning.
Costa, Anna I G; Queiroz, Maria E L R; Neves, Antônio A; de Sousa, Flaviane A; Zambolim, Laércio.
Afiliación
  • Costa AI; Department of Chemistry, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil.
  • Queiroz ME; Department of Chemistry, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil. Electronic address: meliana@ufv.br.
  • Neves AA; Department of Chemistry, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil.
  • de Sousa FA; Department of Chemistry, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil.
  • Zambolim L; Department of Phytopathology, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil.
Food Chem ; 181: 64-71, 2015 Aug 15.
Article en En | MEDLINE | ID: mdl-25794722
This work describes the optimization and validation of a method employing solid-liquid extraction with low temperature partitioning (SLE/LTP) together with analysis by gas chromatography with electron capture detection (GC/ECD) for the determination of nine pesticides (chlorothalonil, methyl parathion, procymidone, endosulfan, iprodione, λ-cyhalothrin, permethrin, cypermethrin, and deltamethrin) in lettuce. The method was found to be selective, accurate, and precise, with means recovery values in the range of 72.3-103.2%, coefficients of variation ⩽ 12%, and detection limits in the range 0.4-37 µg kg(-1). The matrix components significantly influence the chromatographic response of the analytes (above 10%). The optimized and validated method was applied to determine the residual concentrations of the fungicides iprodione and procymidone that had been applied to field crops of lettuce. The maximum residual concentrations of the pesticides in the lettuce samples were 13.6 ± 0.4 mg kg(-1) (iprodione) and 1.00 ± 0.01 mg kg(-1) (procymidone), on the day after application of the products.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Residuos de Plaguicidas / Cromatografía de Gases / Lactuca / Extracción en Fase Sólida Idioma: En Revista: Food Chem Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Residuos de Plaguicidas / Cromatografía de Gases / Lactuca / Extracción en Fase Sólida Idioma: En Revista: Food Chem Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido