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Interactions of imidacloprid with organicand inorganic- exchanged smectites

Published online by Cambridge University Press:  09 July 2018

L. Cox ,
M. C. Hermosin ,
W. C. Koskinen  and
J. Cornejo
L. Cox
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, Sevilla 41080, Spain
M. C. Hermosin*
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, Sevilla 41080, Spain
W. C. Koskinen
Affiliation:
Soil Water Management Research Unit, ARS-USDA, 1991 Upper Buford Circle, St Paul, Minnesota 55108, USA
*
*E-mail: mchermosin@irnase.csic .es
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Abstract

Sorption of the polar insecticide imidacloprid on organic-saturated octadecylammonium (C18) and dioctadecyldimethylammonium (DOD) and inorganic- (Fe- ) saturated Wyoming (W) and Arizona (A) montmorillonites has been investigated. Sorption isotherms were fitted to the Freundlich equation. Imidacloprid-montmorillonite complexes were studied by X-ray diffraction and FT-IR techniques. Imidacloprid sorption coefficients, Kf, decreased in the order WC18> AC18> WFe> WDOD≥ ADOD. The low layer charge and saturation by primary alkylammonium cation facilitates sorption of imidacloprid in the interlayer of the smectite, corroborated by the increase in basal spacing observed in X-ray diffraction patterns and by the presence of absorption band shifts in FT-IR spectra. Imidacloprid sorbs in the interlayer space of smectite mainly by hydrophobic interactions with the alkyl chains in organic smectites and with the uncharged siloxane surface in Fe(III)-smectite. Further polar bonds between the NO2 group of imidacloprid and the NH of the primary alkyl cations and protonation of imidacloprid in Fe-smectites enhanced sorption in these cases.

Keywords

alkylammonium cationsmontmorillonitesorptiondesorption
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 2 , June 2001 , pp. 267 - 274
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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