Chlordecone retention in the fractal structure of volcanic clay

Woignier Thierry, Clostre Florence, Macarie Hervé, Jannoyer Magalie. 2012. Chlordecone retention in the fractal structure of volcanic clay. Journal of Hazardous Materials, 241-242 : pp. 224-230.

Journal article ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : ENGINEERING, CIVIL / Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES / Quartile : Q1, Sujet : ENGINEERING, ENVIRONMENTAL

Abstract : Chlordecone (CHLD), a soil and foodstuff pollutant, as well as an environmentally persistent organochlorine insecticide, was used intensively in banana fields. The chlordecone uptake of three crops was measured for two types of polluted soils: allophanic and non-allophanic. The uptake is lower for allophanic soils even if their chlordecone content is higher than with non-allophanic soils. The fractal structure of the allophane aggregates was characterized at the nanoscale by small angle X-rays scattering, pore size distribution and transmission electron microscopy. We showed that clay microstructures should be an important physico-chemical factor governing the fate of chlordecone in the environment. Allophanic clays result in two counterintuitive findings: higher contaminant trappings yet lower contaminant availability. We propose that this specific, tortuous structure, along with its associated low accessibility, partly explains the low availability of chlordecone confined in allophanic soils. Capsule The fractal and tortuous microstructure of allophane clay favours the chlordecone retention in soils and disfavours the crop uptake. Highlights ? Allophanic soils are highly polluted but less contaminant for cultivated vegetables. ? SAXS and TEM show the fractal structure of allophane aggregates at the nanoscale. ? Allophane aggregates play the role of a labyrinth which fixes and traps chlordecone. ? Allophane physical properties contribute to chlordecone retention in andosols. (Résumé d'auteur)

Mots-clés Agrovoc : Chlordécone, Pollution par l'agriculture, Pollution du sol, Structure du sol, Sol volcanique, Sol argileux, Andosol, Contamination chimique, Produit alimentaire, Dioscorea, Colocasia esculenta, Lactuca sativa

Mots-clés géographiques Agrovoc : Martinique

Classification Agris : P02 - Pollution
P33 - Soil chemistry and physics
Q03 - Food contamination
H01 - Protection of plants - General aspects

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Woignier Thierry, PRAM (MTQ)
  • Clostre Florence, CIRAD-PERSYST-UPR HortSys (MTQ)
  • Macarie Hervé, IRD (MTQ)
  • Jannoyer Magalie, CIRAD-PERSYST-UPR HortSys (MTQ)

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