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Interaction of Rimsulfuron with Smectites

Published online by Cambridge University Press:  28 February 2024

Luca Calamai ,
Ottorino Pantani ,
Alba Pusino ,
Carlo Gessa  and
Paolo Fusi
Luca Calamai
Affiliation:
Dipartimento di Scienza del Suolo e Nutrizione della Pianta, Università di Firenze, Piazzale Cascine 28, 50144 Firenze, Italy
Ottorino Pantani
Affiliation:
Centro di Studio per i Colloidi del Suolo, CNR, Piazzale Cascine 28, 50144 Firenze, Italy
Alba Pusino
Affiliation:
Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agro-Alimentari, Università di Sassari Viale Italia 39, 07100 Sassari, Italy
Carlo Gessa
Affiliation:
Istituto di Chimica Agraria, Università di Bologna, Via Berti Pichat 11, 40127 Bologna, Italy
Paolo Fusi
Affiliation:
Dipartimento di Scienza del Suolo e Nutrizione della Pianta, Università di Firenze, Piazzale Cascine 28, 50144 Firenze, Italy
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Abstract

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The adsorption of the sulfonylurea herbicide rimsulfuron, [N-((4,6-dimethoxypyrimidin-2-yl)aminocarbonyl)-3-(ethylsulfonyl)-2-pyridinesulfonamide], on clay minerals with different saturating cations was studied. Three smectites with different lattice charge distribution (hectorite, montmorillonite and nontronite) were selected and made homoionic to Ca2+, Cu2+ and Al3+. Because of the instability of rimsulfuron in water, the experiments were carried out in chloroform solution. The interaction mechanism depends on the nature of the saturating cation and the tetrahedral layer charge of the silicate. Among the exchangeable ions studied, only Al3+ is able to produce degradation of the herbicide to N-(4,6-dimethoxypyrimidin-2-yl)-N-[(3-(ethylsulfonyl)-2-pyridinyl]urea. In this case, the lower the tetrahedral charge, the more active the degradation. The Ca2+-saturated clays are ineffective in the degradation. In contrast, the formation of a stable chelate complex with the saturating ion permits rimsulfuron to be adsorbed to a rather high extent into Cu(II)-clays and to be stable against degradation.

Keywords

AdsorptionInfrared SpectroscopyPesticidesRimsulfuronSmectites
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 1 , February 1997 , pp. 23 - 27
Copyright
Copyright © 1997, The Clay Minerals Society

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