Organochlorine insecticide residues present in raw milk sold in the department córdoba, colombia

Abstract

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 and gt;ickness. B and gt;e recovery rate for certain pesticides were 7etween 88.5 and 96%, t and gt;e detection limits were defined 7etween 0.01 and 0.04 ng/g, relative standard deviations less t and gt;an 6%. Nn t and gt;e 6+ samples tested p, p’-DDT, a-HCH, ö-HCH, aldrin, dieldrin, endrin, heptachlor, heptachlor epoxide and y-c and gt;lordane were determined, esta7lis and gt;ing concentrations 7etween 2;.1 and 469.6 ng/g. B and gt;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

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 and amp; 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.