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Instituto de Recursos Naturales y Agrobiología de Sevilla, Consejo Superior de Investigaciones Cientificas, P.O. Box 1052, 41080 Sevilla, Spain
USDA-ARS and Dep. of Soil Science, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
*Corresponding author (cornejo{at}cica.es).
ABSTRACT
Sorption-desorption of atrazine and simazine on montmorillonite, ferrihydrite, and humic acid was determined using the batch equilibration procedure. Sorption of atrazine and simazine was higher on humic acid than on montmorillonite. Ferrihydrite does not sorb triazine herbicides. Enhanced sorption of atrazine and simazine on montmorillonite was measured after increasing the surface acidity of the clay. Results indicate sorption of s-triazine herbicides on montmorillonite as protonated species must be preceded by sorption as molecular species on hydrophobic microsites of the clay unless the pH of the bulk solution is close to the pKa of the herbicide. In this latter case, cation exchange would be also operative. Sorption-desorption of atrazine and simazine was more hysteretic for humic acid than for montmorillonite, indicating that these herbicides desorb more difficultly from organic matter than from montmorillonite because of the contribution of hydrophobic interactions with humic acid. It is suggested that, besides organic matter, smectites of low charge density and high surface acidity should increase the retention of s-triazine herbicides in soils.
Received for publication February 5, 1996.
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