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Adsorption and Degradation of Triasulfuron on Homoionic Montmorillonites

Published online by Cambridge University Press:  28 February 2024

Alba Pusino ,
Ilaria Braschi  and
Carlo Gessa
Alba Pusino
Affiliation:
Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agro-Alimentari, Università di Sassari, Viale Italia 39, 07100 Sassari, Italy
Ilaria Braschi
Affiliation:
Istituto di Chimica Agraria, Università di Bologna, Via Berti Pichat 11, 40127 Bologna, Italy
Carlo Gessa
Affiliation:
Istituto di Chimica Agraria, Università di Bologna, Via Berti Pichat 11, 40127 Bologna, Italy
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Abstract

The adsorption and degradation of the herbicide triasulfuron [2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide] (CMMT) on homoionic Fe3+-, Al3+-, Ca2+-, or Na+-exchanged montmorillonite in aqueous medium were studied. Ca- and Na-exchanged montmorillonite were ineffective in the adsorption and degradation of triasulfuron. The adsorption on Fe-and Al-exchanged montmorillonite was rapid, and equilibrium was attained after 5 min. Degradation of the herbicide was slow and the type of the degradation products depended on the nature of the exchangeable cations. In the presence of Fe3+-rich montmorillonite, the metabolites 2-(2-chloro-ethoxy)benzenesulfonamide (CBSA), 2-(2-chloroethoxy)-N-[[(4-hydroxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide (CHMT), and l-[2-(2-chloroethoxy)benzene-l-sulfonyl]-7-acetyl-triuret (CBAT) were the only identified products, whereas 2-amino-4-methoxy-6-methyltriazine (AMMT), CBSA, CHMT, and CBAT were the primary metabolites for the Al3+-rich montmorillonite. A Fourier transform infrared (FT-IR) study of montmorillonite samples after the interaction with triasulfuron in organic solution suggests that the hydrolysis mechanism involves the adsorption of the herbicide on the 2:1 layers.

Keywords

AdsorptionDegradationHerbicidesInfrared SpectroscopyMontmorilloniteTriasulfuron
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 19 - 25
Copyright
Copyright © 2000, The Clay Minerals Society

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