The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays - Aix-Marseille Université Accéder directement au contenu
Article Dans Une Revue Environmental Science and Pollution Research Année : 2018

The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays

Résumé

Some volcanic soils like andosols contain short-range order nanoclays (allophane) which build aggregates with a tortuous and fractal microstructure. The aim of the work was to study the influence of the microstructure and mesoporosity of the allophane aggregates on the pesticide chlordecone retention in soils. Our study shows that the allo-phane microstructure favors pollutants accumulation and se-questration in soils. We put forth the importance of the meso-porous microstructure of the allophane aggregates for pollutant trapping in andosols. We show that the soil contamination increases with the allophane content but also with the mesopore volume, the tortuosity, and the size of the fractal aggregate. Moreover, the pore structure of the allophane aggregates at nanoscale favors the pesticide retention. The fractal and tortuous aggregates of nanoparticles play the role of nanolabyrinths. It is suggested that chlordecone storage in allophanic soils could be the result of the low transport properties (permeability and diffusion) in the allophane aggregates. The poor accessibility to the pesticide trapped in the mesopore of allophane aggregates could explain the lower pollutant release in the environment.
Fichier principal
Vignette du fichier
Thierry-Woignier-2017-Pesticide-Chlordecone.pdf (742.41 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01779364 , version 1 (02-05-2018)

Identifiants

Citer

Thierry Woignier, Florence Clostre, Paula Fernandes, Alain Soler, Luc Rangon, et al.. The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays. Environmental Science and Pollution Research, 2018, 25 (22), pp.21350-21361. ⟨10.1007/s11356-017-9370-1⟩. ⟨hal-01779364⟩
182 Consultations
328 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More