Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Crampon M., Copard Y., Favreau Guillaume, Raux J., Merlet-Machour N., Le Coz M., Ibrahim M., Peulon-Agasse V., Portet-Koltalo F. (2014). Occurrence of 1,1 '-dimethyl-4,4 '-bipyridinium (Paraquat) in irrigated soil of the Lake Chad Basin, Niger. Environmental Science and Pollution Research, 21 (18), 10601-10613. ISSN 0944-1344

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1007/s11356-014-3064-8

Titre
Occurrence of 1,1 '-dimethyl-4,4 '-bipyridinium (Paraquat) in irrigated soil of the Lake Chad Basin, Niger
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000342132500005
AuteursCrampon M., Copard Y., Favreau Guillaume, Raux J., Merlet-Machour N., Le Coz M., Ibrahim M., Peulon-Agasse V., Portet-Koltalo F.
SourceEnvironmental Science and Pollution Research, 2014, 21 (18), p. 10601-10613. ISSN 0944-1344
RésuméIncreased use of agrochemical products to improve yields for irrigated crops in sub-Saharan Africa has been accompanied by a significant increase in the risk of environmental contamination. Detailed examples of the fate of pesticides after initial spreading on crop fields are scarce in tropical regions, where safe practices and related health risks are poorly understood by smallholder farmers. In the semi-arid environment of the Lake Chad Basin, SE Niger, both intrinsic properties of pesticides and extrinsic factors such as soil and climate helped to characterize processes leading to an accumulation of pesticides in soils. Analysis by HPLC-UV of a 6 m deep soil profile showed the presence of Paraquat at concentrations from 953 +/- 102 mu g kg(-1) to 3083 +/- 175 mu g kg(-1) at depths between 0.80 and 2.75 m below the land surface. Soil analysis revealed that up to approximately 15 % of the total soil matrix consists of smectites, a clay mineral capable of retaining cationic pesticides such as Paraquat, and a very low content of organic matter (<0.15 wt.% TOC). Paraquat could be stored and not bioavailable in a clayey barrier at approximately 2-m depth and therefore does not represent an immediate risk for populations or environment in this form. However, if the Paraquat application rate remains constant, the clayey barrier could reach a saturation limit within 150-200 years and 180-220 years if we consider a DT50 in soil of similar to 1,000 days (FAO). Consequently, it could lead to a deeper infiltration and so a pollution of groundwater. Such a scenario can represent a health risk for drinking water and for the Lake Chad, which is a major resource for this densely populated region of semi-arid Africa. Further analyses should focus on deeper layers and groundwater Paraquat contents to validate or invalidate the hypothesis of storage in this clay-rich layer.
Plan de classementPédologie [068] ; Hydrologie [062] ; Pollution [038]
Descr. géo.NIGER ; TCHAD LAC
LocalisationFonds IRD [F B010062571]
Identifiant IRDfdi:010062571
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062571

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito