Abstract

CARDONA, Yaneth et al. STANDARDIZATION OF ANALYTICAL METHOD FOR EXTRACTION AND QUANTIFICATION OF CYPERMETRHIN IN GRASS. Rev.Colomb.Quim. [online]. 2011, vol.40, n.2, pp.211-226. ISSN 0120-2804.

In this study, an analytical method has been developed to determine cypermethrin in grass matrices using direct immersion solid-phase microextraction (DI-SPME), coupled to gas chromatography with flame ionization detector (GC-FID). The optimized DI-MEFS experimental procedures to extract cypermethrin in grass matrix were: 5 g of the sample were heated with 10 mL of acetone 1% v/v in water during 10 min. 4 mL of this solution were used for extracting with a polydimethylsiloxane (PDMS)-coated fiber at 60 °C and 500 rpm during 30 min. The analyte desorption was performed at 270 °C for 6 min. The proposed procedure showed linear behavior in the range tested (5-300 mg/L) with R² of 0.999. The detection and quantification limits were 1.53 and 4.97 ng/ mL respectively with a standard deviation of 8.57% (n = 6). The method proposed in this paper allows determining cypermethrin in samples of grass to trace levels with a recovery of 99.08%.

Keywords : Pesticide; pyrethroids; cypermethrin; solid-phase microextraction (SPME); gas chromatography with FID (GC-FID).

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