Determination of pesticides in lettuce using solid-liquid extraction with low temperature partitioning.
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.
Palabras clave
Chlorothalonil (PubChem CID: 15910); Cypermethrin (PubChem CID: 2912); Deltamethrin (PubChem CID: 40585); Endosulfan (PubChem CID: 3224); Gas chromatography; Iprodione (PubChem CID: 37517); Lettuce; Methyl parathion (PubChem CID: 4130); Permethrin (PubChem CID: 40326); Pesticides; Procymidone (PubChem CID: 36242); λ-Cyhalothrin (PubChem CID: 443046)
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