Resumo

VALENCIA, Eliana M.; GUERRERO, Jairo A.; DE YUNDA, Amanda  e  MARTINEZ, María J.. EVALUATION OF 14C-carbofuran AND FURADAN 3SC® ADSORPTION-DESORPTION IN THREE CUNDINAMARCA SOILS (COLOMBIA). Rev.Colomb.Quim. [online]. 2008, vol.37, n.1, pp.79-91. ISSN 0120-2804.

Carbofuran is a N-Methylcarbamate frequently used in strawberry cultivation in Colombia. Due to its toxicity it is important to evaluate its migration in the strawberry production system. In this work the adsorption-desorption of 14C carbofuran (analytical standard) and commercial pesticide (Furadan) was studied by Freundlich isoterms in superficial soils of three locations in Cundinamarca state, a major strawberry production area in Colombia. The pesticide concentrations were between the ranges normally used in the farming (ranged between 0.12 and 2.57 µg/mL). A good model adjust was present in all the studies. The adsorption of 14C carbofuran on the 3 studied soils was low; with adsorption coefficients values (logKd) ranging between 0.04 to 0-40. The adsorption coefficients normalised with the organic carbon content of soil (logKOC) ranged from 1.73 to 2.05. Significant differences were found between a commercial pesticide (Furadan) and an analytical carbofuran and were associated with the organic matter humification grade in the different soils and the presence of adyuvants in the formulate one. Hysteresis effect was not presented in the soils studied.

Palavras-chave : Adsorption; desorption; 14C-carbofuran; hysteresis; soil.

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