Development and validation of methodology for the determination of residues of organophosphorus pesticides in tomatoes

• Autor(a) principal: Gobo,Anagilda B.
• Data de Publicação: 2004
• Outros Autores: Kurz,Márcia H. S., Pizzutti,Ionara R., Adaime,Martha B., Zanella,Renato
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000600024
• topic: pesticide residues; organophosphorus; GC-NPD; tomato

The organophosphorus pesticides are frequently applied in tomato cultivation in Brazil. In the present work an analytical methodology for quantification of the organophosphorus pesticides: acephate, chlorpyrifos, malathion, methamidophos and parathion-methyl residues in tomatoes was developed and validated using Gas Chromatography with a Nitrogen-Phosphorus Detector (GC-NPD). The possibility of a matrix effect was studied. Analytical curves prepared in an extract of the matrix were linear from 0.006 to 0.80 mg L-1. The precision studies supplied results with RSD <15%. The recoveries of the pesticides calculated from the curve prepared in the matrix extract were between 88 and 118%. With the proposed procedure quantification limits between 0.0132 and 0.135 mg kg-1 were obtained.