Organochlorine insecticide residues present in raw milk sold in the Department Córdoba, Colombia | Residuos de insecticidas organoclorados presentes en leche cruda comercializada en el departamento de Córdoba, Colombia

English. In this investigation organochlorine pesticide residues in raw milk from Dairy herds in the Cordoba department were determined. During the extraction procedure using a column of diatomaceous earth as eluting system a mixture of n-hexane-acetone-ethyl acetate (4:2:1), followed by 5% methanol in hexane. For the determination we used a gas Chromatograph Perkin Elmer, Autosystem XL with elec- tron capture detector, split less injection mode, a capillary column Rtx-5 30m, 0.25 mm id and 0.25 um film t>ickness. B>e recovery rate for certain pesticides were 7etween 88.5 and 96%, t>e detection limits were defined 7etween 0.01 and 0.04 ng/g, relative standard deviations less t>an 6%. Nn t>e 6+ samples tested p, p’-DDT, a-HCH, ö-HCH, aldrin, dieldrin, endrin, heptachlor, heptachlor epoxide and y-c>lordane were determined, esta7lis>ing concentrations 7etween 2;.1 and 469.6 ng/g. B>e freOuen- cies of occurrence ranged between 1.6 and 65.1% for heptachlor and p, p’-DDT, respectively. The older population that lives in the sub-regions: Middle Sinú, San Jorge and Savannas were exposed to high health risk associated with the concentration of a-HCH, aldrin and dieldrin in raw milk

Spanish; Castilian. En el estudio se determinaron residuos de plaguicidas organoclorados en leche cruda proveniente de hatos lecheros del departamento de Córdoba, Colombia. Durante el procedimiento de extracción se utilizó una columna de tierra de diatomeas y como sistema eluyente una mezcla de n-hexano-acetona- acetato de etilo (4:2:1), seguida de metanol al 5% en hexano. Para la determinación se usó un cromató- grafo de gases Perkin Elmer, Autosystem XL con detector captura de electrones, en modo de inyección 'splitless', una columna capilar Rtx-5 30 m, 0.25 mm di y 0.25 μm de espesor de película. El porcen- taje de recuperación para los plaguicidas determinados se encontró entre 88.5 y 96%, los lImites de detección se definieron entre 0.01 y 0.04 ng/g con desviaciones estãndar & 6%. En las 6+ muestras analizadas se determinaron p,p´-DDT, a-HCH, ö-HCH, aldrín, dieldrín, endrín, heptacloro, heptacloro epóxido y y-clordano, esta7leciendo concentraciones entre 2;.1 y 469.6 ng/g.