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Processus d'adsorption du dinoseb sur l'hectorite-et la vermiculite-decylammonium

Published online by Cambridge University Press:  09 July 2018

A. Vimond-Laboudigue ,
M-H. Baron ,
J-C. Merlin  and
R. Prost
A. Vimond-Laboudigue
Affiliation:
Station de science du sol, INRA, Route de St Cyr, 78026 Versailles Cedex
M-H. Baron
Affiliation:
Laboratoire de Spectrochimie Infrarouge et Raman, CNRS, 2 rue Henri Dunant, 94320 Thiais
J-C. Merlin
Affiliation:
Laboratoire de Spectrochimie Infrarouge et Raman, CNRS, Section de Lille, Bât. C.5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
R. Prost
Affiliation:
Station de science du sol, INRA, Route de St Cyr, 78026 Versailles Cedex
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Resume

Les substrats argile-alkylammonium sont utilisés dans ce travail comme des modèles de sol, dans le but d'étudier les interactions entre un pesticide neutre peu soluble dans l'eau, le dinoseb, et des substrats dont les surfaces ont été rendues hydrophobes. Les spectrométries infrarouge (IR), Raman et de réflexion diffuse dans l'UV-visible sont utilisées de façon complémentaire aux isothermes d'adsorption pour préciser la localisation et l'état des molécules pesticide retenues sur les substrats. Dans le cas de la vermiculite-décylammonium, la fixation du dinoseb est observée à la fois sur les surfaces externes et dans les espaces interfoliaires, les molécules de pesticide sont directement en interaction avec les atomes d'oxygène de la surface des feuillets et avec les cations ammonium, par liaisons hydrogène. Le taux de molécules de dinoseb retenues sur l'hectorite-décylammonium est beaucoup plus faible. Les molécules fixées ont alors une structure voisine de celle des molécules libres. Ces analyses montrent que le caractère hydrophobe de la surface des complexes organominéraux est une condition nécessaire, mais non suffisante, pour la fixation de molécules peu solubles dans l'eau. Notre étude souligne l'importance des interactions spécifiques par liaison hydrogène entre le pesticide et le feuillet de vermiculite dans le processus de rétention.

Abstract

Abstract

Vermiculite- and hectorite-decylammonium were chosen as models of soil in order to determine interactions involved in the adsorption of dinoseb, a neutral pesticide with low solubility in water, on hydrophobic substrates. Infrared (IR), Raman and electronic diffuse reflectance spectroscopies and adsorption isotherms provided complementary information on the state and the location of adsorbed molecules. A high rate of dinoseb adsorption is observed on vermiculite-decylammonium, both on external surfaces and in interlayer spaces of the substrate. Adsorbed molecules are shown to be hydrogen bonded to the silicate oxygen surfaces and to the ammonium groups. The uptake of dinoseb by hectorite-decylammonium is significantly lower. The structures of retained molecules are close to those of dinoseb molecules in an apolar medium. This study indicates that specific interactions are necessary for the fixation of great amounts of molecules on clay- alkylammonium complexes. The hydrophobic characteristic of the surface appears to be a necessary but not sufficient condition in the adsorption process.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 1 , March 1996 , pp. 95 - 111
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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