Woignier T. auteur aut IRD Clostre F. auteur aut IRD Macarie Hervé auteur aut IRD Jannoyer M. auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Chlordecone Allophanic clay Fractal microstructure SAXS Plant uptake MARTINIQUE 068 021 076 241 224-230 2012 0304-3894 https://www.documentation.ird.fr/hor/fdi:010058848 10.1016/j.jhazmat.2012.09.034 0304-3894 [F B010058848] https://www.documentation.ird.fr/hor/fdi:010058848 https://www.documentation.ird.fr/intranet/publi/2013/02/010058848.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-03-06 2017-08-23 fdi:010058848 fre