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Interaction of aminotriazole with montmorillonite and Mg-vermiculite at pH 4

Published online by Cambridge University Press:  09 July 2018

E. Morillo ,
J. L. Perez-Rodriguez ,
P. Rodriguez-Rubio  and
C. Maqueda
E. Morillo
Affiliation:
Instituto de Recursos Naturales y Agrobiología, CSIC, Apdo. 1052, 41080 Sevilla, Spain
J. L. Perez-Rodriguez
Affiliation:
Instituto de Ciencia de Materiales, CSIC, Apdo. 1115, 41080 Sevilla, Spain
P. Rodriguez-Rubio
Affiliation:
Escuela Politécnica Superior Campus de La Rábida, Universidad de Huelva, Spain
C. Maqueda
Affiliation:
Instituto de Recursos Naturales y Agrobiología, CSIC, Apdo. 1052, 41080 Sevilla, Spain
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Abstract

The interaction of aminotriazole (AMT) at pH 4 on Wyoming montmorillonite (mainly with Na ions) and Mg-vermiculite has been studied by X-ray diffraction and infrared spectroscopy. The AMT is adsorbed on montmorillonite in the cationic form by cation exchange. The amount of pesticide adsorbed was 71 mEq/100 g, which comprises ∼91% of the CEC of this sample (78.2 mEq/100 g). Saturation was reached in 24 h, giving rise to a complex with basal spacing 12.5 Å. Vermiculite adsorbs 167 mEq/100 g, almost 20% greater than the CEC (141 mEq/100 g), and the basal spacing was stabilized at 13.68 Å after five weeks of treatment with AMT. A part of the AMT is adsorbed in cationic form, displacing a great part of the exchangeable Mg2+ cations. The rest is adsorbed in molecular form by coordination to the Mg2+ cations which remain in the interlamellar space, removing a great amount of water, and remaining in the interlamellar space of vermiculite after washing with water, probably because of a steric hindrance from the AMT cations adsorbed.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 2 , June 1997 , pp. 307 - 313
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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