Abstract

Organochlorine insecticide residues present in raw milk sold in the Department Córdoba, Colombia. Acta Agron. [online]. 2012, vol.61, n.1, pp.10-15. ISSN 0120-2812.

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 electron capture detector, split less injection mode, a capillary column Rtx-5 30m, 0.25 mm id and 0.25 um film thickness. The recovery rate for certain pesticides were between 88.5 and 96%, the detection limits were defined between 0.01 and 0.04 ng/g, relative standard deviations less than 6%. In the 63 samples tested p, p'-DDT, a-HCH, d-HCH, aldrin, dieldrin, endrin, heptachlor, heptachlor epoxide and g-chlordane were determined, establishing concentrations between 27.1 and 469.6 ng/g. The frequencies 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 a-HCH, aldrin and dieldrin in raw milk.

Keywords : Cow milk; organochlorine pesticides; pesticide persistence; residues.

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