Abstract

PENA-MARTINEZ, Yetmy Rocío; GUERRERO-DALLOS, Jairo Arturo  and  MARTINEZ-CORDON, María José. Adsorption-desorption of diuron and ametryn in Colombian and Spanish soils. Rev.Colomb.Quim. [online]. 2018, vol.47, n.3, pp.31-40. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v47n3.70402.

Although there is currently a great concern about pollution and the possible effects on health generated by the frequent use of herbicides, environmental studies in tropical countries are scarce, especially in Colombia. Therefore, in the present study, the adsorption-desorption of diuron and ametryn was evaluated in Colombian (SC) and Spanish soils (SE). The adsorption-desorption tests were carried out with molecules of 14C radiolabeled herbicides, using the batch equilibrium technique. In both soils and for both herbicides there was a good fit to the Freundlich isotherms with R2 greater than 0.99. For diuron, in SE (Kfa= 12.82 ± 1.23) showed greater adsorption affinity than SC soil (4.56 ± 0.26). In contrast, for ametryn we found Kfa values of = 6.47 ± 0.25 in SC and 3.05 ± 0.08 in SE, showing greater interaction with SC compared to SE. For diuron, a higher degree of hysteresis was observed in SC and for ametryn in SE, showing that the interaction of the two herbicides with the soil components is different depending on their mineralogical constitution and their pH value.

Keywords : herbicides; retention; tropical zones; temperate zones; batch equilibrium.

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