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Interaction of the Herbicide Acifluorfen with Montmorillonite: Formation of Insoluble Fe3+, Al3+, Cu2+, and Ca2+ Complexes

Published online by Cambridge University Press:  02 April 2024

A. Pusino ,
G. Micera  and
C. Gessa
A. Pusino
Affiliation:
Istituto di Chimica Agraria, Université di Sassari, Via E. de Nicola 10, 07100 Sassari, Italy
G. Micera
Affiliation:
Dipartimento di Chimica, Universitá di Sassari, Via Vienna 2, 07100 Sassari, Italy
C. Gessa
Affiliation:
Istituto di Chimica Agraria, Université di Sassari, Via E. de Nicola 10, 07100 Sassari, Italy
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Abstract

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Analytical, spectroscopic, and X-ray powder diffraction techniques were used to investigate the adsorption of the herbicide sodium acifluorfen (acifluorfen = 5-[2-chloro-4-(trifluorornethyl)phenoxy]-2-nitrobenzoic acid) from aqueous solution onto Cu2+-, Al3+-, Fe3+-, and Ca2+-saturated montmorillonite. As indicated by infrared and electron spin resonance spectra, which are coincident with those of the corresponding solid metal complexes, and by the basal spacings, which are the same for all the samples, acifluorfen extracted the exchangeable ions from the clay interlayer and precipitated them on external surfaces. The process involved the replacement of sodium as the saturating ion and was due to the formation of insoluble complexes between the herbicide and polyvalent metal ions.

Keywords

AdsorptionAcifluorfenInfrared spectroscopyInterlayer cationsMontmorillonitePesticides
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 1 , February 1991 , pp. 50 - 53
Copyright
Copyright © 1991, The Clay Minerals Society

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