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Interactions of imidacloprid with organic- and inorganic-exchanged smectites

Cox, L ; Hermosín, M. C ; Koskinen, W. C ; Cornejo, J

Clay minerals, 2001-06, Vol.36 (2), p.267-274 [Periódico revisado por pares]

London: Mineralogical Society

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Título:
Interactions of imidacloprid with organic- and inorganic-exchanged smectites
Autor: Cox, L ; Hermosín, M. C ; Koskinen, W. C ; Cornejo, J
Assuntos: Arizona ; cations ; clay minerals ; Clay soils ; desorption ; Earth sciences ; Earth, ocean, space ; Environmental geology ; Exact sciences and technology ; imidacloprid ; Mineralogy ; montmorillonite ; organic compounds ; pollutants ; pollution ; sheet silicates ; Silicates ; smectite ; soil treatment ; soils ; sorption ; United States ; Wyoming
É parte de: Clay minerals, 2001-06, Vol.36 (2), p.267-274
Descrição: The polar insecticide imidacloprid was adsorbed on organic saturated octadecylammonium (C18), dioctadecyldimethylammonium (DOD) and Fe-saturated Wyoming (W) and Arizona (A) montmorillonites. Sorption isotherms were fitted to the Freundlich equation. Sorption coefficients Kf decreased in the order WC18 > AC18 > WFe > WDOD ≥ ADOD. Sorption of imidacloprid is affected by layer charge and the degree of saturation of the interlayer space and leads to an increase of basal spacing and to a shift of the FTIR absorption bands. Sorption occurs mainly by hydrophobic interactions with the alkyl chains in organophilic smectites and with the uncharged siloxane surface in the Fe(III) smectite. The available space between organic cations is more important than the high hydrophobicity of the interlayer. Further polar bonds between the NO2 group of the imidacloprid and the NH of the primary alkyl cations and protonation of imidacloprid in Fe-smectites due to the high polarizing water and low pH, enhanced sorption.
Editor: London: Mineralogical Society
Idioma: Inglês

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Interactions of imidacloprid with organic- and inorganic-exchanged smectites

Cox, L ; Hermosín, M. C ; Koskinen, W. C ; Cornejo, J

London: Mineralogical Society

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