Resumo

SANTOS NETO, Alvaro José dos  e  SIQUEIRA, Maria Elisa Pereira Bastos de. Analysis of organophosphorus pesticides in water using SPE C18 disks and gas chromatography: evaluation of Furnas dam contamination. Quím. Nova [online]. 2005, vol.28, n.5, pp. 747-750. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422005000500002.

Solid phase extraction (SPE) in C18 disks has been optimized and validated for extraction of 5 organophosphorus (OP) pesticides in water. Extraction has been followed by separation and detection by gas chromatography/flame photometry. Excellent linearity was obtained for all compounds (r greater than 0.99), with CVs between 1.0-6.9%, recoveries between 73-95% and quantification limits between 2.5-5.0 µg L^-1. Samples from Furnas dam were analyzed monthly during one year and 10% showed OP pesticide residues.

Palavras-chave : organophosphorus pesticides; solid phase extraction disks; water.