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Interaction of Fluazifop with Al-, Fe3+-, and Cu2+-Saturated Montmorillonite

Published online by Cambridge University Press:  02 April 2024

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

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The adsorption of the pesticide Fluazifop, (RS)-2-[4-[[(5-trinuoromethyl)-2-pyridin-yl]oxy]phenoxy] propanoic acid, on homoionic Cu2+-, Fe3+-, and Al-bentonites was investigated by infrared and electron spin resonance spectroscopy. For comparison, the binary complexes of the acid containing the above ions were prepared and characterized. On the whole, the results show that the interaction of the acid with the clay may have involved both the protonation of the pyridine nitrogen atom, due to a proton transfer from the acid metal-bound water, and the formation of direct bonds between the carboxylate groups and the exchange cations. The extent of these interactions was dependent on the nature of the metal ions, the Cu ions being more effective in producing CHCl3-extractable neutral carboxylate complexes, while Al and Fe favored the formation of species bearing protonated nitrogen atoms and un-dissociated carboxyl groups.

Keywords

AdsorptionElectron spin resonanceFluazifopInfrared spectroscopyInterlayer cationsPesticide
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 4 , August 1988 , pp. 354 - 358
Copyright
Copyright © 1988, The Clay Minerals Society

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