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Interactions of methomyl with montmorillonites

Published online by Cambridge University Press:  09 July 2018

L. Cox ,
M. C. Hermosín  and
J. Cornejo
L. Cox
Affiliation:
Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC Aptdo. 1052, Sevilla 41080, Spain
M. C. Hermosín
Affiliation:
Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC Aptdo. 1052, Sevilla 41080, Spain
J. Cornejo
Affiliation:
Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC Aptdo. 1052, Sevilla 41080, Spain
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Abstract

The adsorption of the insecticide methomyl (S-methyl N-(methylcarbamoyloxy)thioacetimidate) by smectites with different layer charge (SWy and SAz montmorillonites and SH-Ca hectorite) has been determined. Adsorption has been expressed as the adsorbent/adsorbate distribution coefficient Kd, which increased when the layer charge of the smectite decreased. The Kd values for homoionic SWy montmorillonite samples increased when the ionic potential of the interlayer cation decreased, except for SWy-Fe3+. Infrared (IR) spectra and X-ray diffraction (XRD) analysis of the SWy-K+ and SWy-Na+ montmorillonites treated with methomyl suggest that pesticide molecules interact through polar bonds with the interlamellar cation. In the case of SWy-Fe3+, kinetic studies, high performance liquid chromatography (HPLC), IR and XRD data indicated that adsorption and degradation both account for the high Kd value obtained.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 5 , December 1994 , pp. 767 - 774
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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