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-chloroethoxy)benzenesulfonamide (CBSA), 2-(2-chloroerhoxy)-N-[[(4-hydroxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide (CHMT), and 1-[2-(2-chtoroethoxy)benzene-1-sulfonyl]-7-acetyl-triuret (CBAT) were the only identified products, whereas 2-amino-3-methoxy-6-methyltriazine (AMMT), CBSA, CHMT, and CBAT were the primary metabolites fur the Al3+-rich montmorillonite. A Fourier transform infrared (FT-TR) 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.

Adsorption and degradation of triasulfuron on homoionic montmorillonites / Pusino A; Braschi I; Gessa C. - In: CLAYS AND CLAY MINERALS. - ISSN 0009-8604. - 48:1(2000), pp. 19-25. [10.1346/CCMN.2000.0480103]

Adsorption and degradation of triasulfuron on homoionic montmorillonites

PUSINO, Alba;
2000

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-chloroethoxy)benzenesulfonamide (CBSA), 2-(2-chloroerhoxy)-N-[[(4-hydroxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide (CHMT), and 1-[2-(2-chtoroethoxy)benzene-1-sulfonyl]-7-acetyl-triuret (CBAT) were the only identified products, whereas 2-amino-3-methoxy-6-methyltriazine (AMMT), CBSA, CHMT, and CBAT were the primary metabolites fur the Al3+-rich montmorillonite. A Fourier transform infrared (FT-TR) 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.
Adsorption and degradation of triasulfuron on homoionic montmorillonites / Pusino A; Braschi I; Gessa C. - In: CLAYS AND CLAY MINERALS. - ISSN 0009-8604. - 48:1(2000), pp. 19-25. [10.1346/CCMN.2000.0480103]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/82252
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