Sorption of the Herbicide Terbumeton and its Metabolites onto Soils. Influence of Copper(II)

David Abiven; Stéphanie Boudesocque; Emmanuel Guillon,; Michel Couderchet; Jacques Dumonceau; Michel Aplincourt

doi:10.1071/EN05060

RESEARCH ARTICLE

Sorption of the Herbicide Terbumeton and its Metabolites onto Soils. Influence of Copper(II)

David Abiven ^A , Stéphanie Boudesocque ^B , Emmanuel Guillon, ^B , Michel Couderchet ^A , Jacques Dumonceau ^B and Michel Aplincourt ^B ^C

+ Author Affiliations

- Author Affiliations

^A Laboratoire d’Eco-toxicologie, Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims Cedex 2, France.

^B GRECI (Groupe de Recherche en Chimie Inorganique), Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims Cedex 2, France.

^C Corresponding author. Email: michel.aplincourt@univ-reims.fr

Environmental Chemistry 3(1) 53-60 https://doi.org/10.1071/EN05060
Submitted: 12 July 2005 Accepted: 4 November 2005 Published: 2 March 2006

Environmental Context. Agrochemicals have contributed greatly to modern agriculture, allowing better yields and lower costs. However, their extensive use has led to frequent contamination of underground and surface water. A better knowledge of the fate of pesticides from the sprayer to the water that would take into account the diversity of the physical and chemical properties of the various molecules and environmental conditions should help in the challenge of protecting and restoring natural water quality.

Abstract. The intensive use of terbumeton (N-(1,1-dimethyl)-N′-ethyl-6-methoxy-1,3,5-triazine-2,4-diamine) has resulted in its widespread presence, together with its main metabolites, in surface- and groundwater. To estimate the fate of these compounds, their adsorption and desorption properties were studied in vineyard soils. The values of the organic carbon normalized adsorption coefficient (K_OC) for terbumeton (34.6 and 39.2 L g⁻¹) were significantly higher than those of its metabolites (between 6.8 and 21.1 L g⁻¹). Terbumeton exhibited a higher adsorption capacity and a lower desorption potential as compared with the metabolites. An important hysteresis was observed in all cases. The Freundlich isotherms exhibited a linear shape, which was interpreted as non-specific interaction. The influence of copper(II), a ubiquitous metal cation in vineyard soils, on pesticide sorption was also studied. Copper significantly decreased the amount of adsorbed terbumeton when present in a high concentration (2 ×10⁻⁴ M).

Keywords. : copper(II) — metabolites — soils — sorption — terbumeton

Acknowledgements

The authors thank the ‘Département de la Marne’ and the ‘Ville de Reims’ for their financial support (program ‘Zérophyto’/AQUAL). We also thank the ‘Fondation du site Paris–Reims’ for a postdoctoral fellowship to D.A. and the ‘Département de la Marne’ for a grant to S.B. We are indebted to Dr E. Marceau (UMR CNRS 7609, Université Pierre et Marie Curie, Paris) for XRD measurements.

References

Sorption of the Herbicide Terbumeton and its Metabolites onto Soils. Influence of Copper(II)

Acknowledgements

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