Abstract

RAMIREZ, David Horacio; ZULUAGA, Adriana Marcela  and  GOMEZ, Evelio de Jesús. EVALUACIÓN DEL RIESGO DE CONTAMINACIÓN POR METAMIDOFOS EN LA MICROCUENCA EL SALTO DEL MUNICIPIO DE EL SANTUARIO, ANTIOQUIA. Rev.EIA.Esc.Ing.Antioq [online]. 2007, n.8, pp.165-180. ISSN 1794-1237.

This investigation was done in El Salto watershed basin located in the municipality of El Santuario. It was examined the presence of Metamidofos in plants of cabbage, in soils, with risk of contamination in waters for the human consumption. The level of concentration of Metamidofos exceeded the maximum limits established by Codex Alimentarius. In the soil, remainders of the product were not found, but they were present in runoff and in two sites of the channel of the gorge, located upstream of the intake of the municipal water system. Metamidofos was not found in the water sample of intake nor in the distribution network of the municipal water system. In the qualitative estimation of the contamination risk, precipitation, runoff, coefficient of runoff, time of concentration, physical and chemical characteristics, erosion, some properties and the slope of lands were chosen as variable of vulnerability and threat; it was observed that the risk appears by the high amount of insecticide used and its frequency of use which is increased by the distribution and intensity of rains, the erosion potencial that occurs by inappropiate use of the ground. In the experimental parcel and a near land cultivated with grass Kikuyo (Pennisetum clandestinum) was considered the population by area unit of the earthworm (Lumbricus terrestris). The absence of this organism in the parcel cultivated with cabbage can be a biological factor by the contamination of this insecticide in the ground.

Keywords : Metamidofos; contamination by plaguicides; cabbage; Brassica oleraceae; El Salto watershed basin.

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