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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal AgroParisTech université Paris-Saclay

Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

2014-2015 CEPAG

Projet CEPAG : Sytème de laboratoire
Contamination of surface waters by pesticides: development and assessment of an evaluation tool to assess pesticide gaseous deposition (Carole Bedos, Benjamin Loubet)
Project duration:

Extended in 2014-2015 (initial: 2009-2012)

Contacts Ecosys :

Carole Bedos et Benjamin Loubet



Risk assessment of the contamination of surface waters located closed to treated field with pesticides often focuses on the empirical assessment of the contamination by spray drift. Other pathways of transfer are thus often neglected, like gaseous deposition linked to the fraction of pesticide volatilized from the applied surface after the application. However, several studies have shown that gaseous deposition may lead to higher deposition than those linked to spray drift under some circumstances. Such evaluation has been proposed by the FOCUS Air group who also mentioned the lack of operational tools.

Our lab develops and uses experimental and modelling approaches to quantitatively analyse pesticide deposition. Methods and tools have been developed to predict pesticide volatilization (Volt’Air model) as well as atmospheric dispersion and gaseous deposition at the local scale (FIDES model). One output of the previous project carried out from 2010 to 2011 and founded by ONEMA was an operational tool to predict pesticide gaseous deposition on surface waters at the local scale, via deposition curves built from outputs from coupled emission-deposition models.


The new project (2014-2015) focuses on:

  • Extension to other types of emission (volatilization from crop surfaces) and buffer zones (edges, trees …); proposition of first recommendations on local configurations to protect surface waters located close to treated fields.
  • Compare with existing dataset.

Further developments could focus on:

  • Comparison with various conditions and configurations.
  • Analysis of the contribution to surface water contamination of gaseous deposition compared to other pathways of contamination (runoff, …).
 Description :

The main actions of the project are:

  • The extension to other types of emission (Volt’Air-Pesticides is replaced by the coupled model Volt’Air Veg developped by coupling Volt’Air-Pesticides and Surfatm and describing thus pesticide volatilization from bare soil as well as from crops) and also to other local spatial configurations including hedges / trees (FIDES is replaced by MODDAS which is able to describe atmospheric dispersion when spatial discontinuities exist); runs are carried out following the same approach as the one developed previously ;
  • new experimentations are carried out with an adapted lab system in order to assess the relevance of the parameterization describing pesticide gaseous exchanges between the air and the water as implemented in the model;
  • comparison with an existing dataset at the field scale;

See also

Publications (from the first project) :

Fait Marquant 2012 de l'UMR (Carole Bedos) : fichier PDF (Open Access)

Bedos C., Loubet B., Barriuso E., 2013. Gaseous deposition contributes to the contamination of surface waters by pesticides close to treated fields. A process-based model study. Environmental Science and Technology, in press. Published online.

Bedos C., Loubet B., Barriuso E., 2013. Contamination des eaux de surface par les pesticides : évaluation de la part des dépôts gazeux aériens. Innovations Agronomiques, 28, 3, 25-33. (Open Access)

poster Olivier Fanucci (2013)

ONEMA website: