Resumo

GARCIA CARRILLO, Mario et al. Relationship of dieldrin and soil properties in Comarca Lagunera, Mexico. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.8, pp.1691-1703. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v8i8.695.

Pesticide residues have recently been reported in the environment as a result of applications of these products for several decades. Globally, there are problems attributed to the effects of pesticide contamination on natural resources; however, in Mexico, there are not enough studies of pesticide contamination. The objective was to evaluate the presence of pesticides in soils of seven localities of five municipalities of the Comarca Lagunera in the state of Coahuila, a soil sampling at five depths (0-8, 8-23, 23-38, 38-53 and 53-68 cm) at the rate of a composite sample per hectare to determine the degree of soil contamination by pesticides. The soxhlet method was used for the extraction of pesticides in the sample and a Danish Kuderna for the concentration. Gas chromatography was used. It was found that dieldrin was the only organochlorine pesticide present in soils studied; the superficial layers of the soil (0-8 and 8-23 cm) showed the highest concentrations of dieldrin. The organic matter content, clay percentage and pH of the soil were the most influential characteristics on the concentration of dieldrin in the soil, presenting the highest determination coefficients (r2= 0.99, 0.84 and 0.96, respectively). In the soils of the particular farms studied, the highest concentrations of dendrin were observed in the surface layer (0-23 cm), in relation to the common evaluated; these values were of the order of 2.57 and 1.22 ng g-1, respectively.

Palavras-chave : depth; dieldrin; organic matter.

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