Publications des scientifiques de l'IRD

Woignier T., Clostre F., Fernandes P., Soler A., Rangon Luc, Sastre-Conde M. I., Jannoyer M. L. (2018). The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays. Environmental Science and Pollution Research, 25 (22), p. 21350-21361. ISSN 0944-1344.

Titre du document
The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000440115600009
Auteurs
Woignier T., Clostre F., Fernandes P., Soler A., Rangon Luc, Sastre-Conde M. I., Jannoyer M. L.
Source
Environmental Science and Pollution Research, 2018, 25 (22), p. 21350-21361 ISSN 0944-1344
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 allophane microstructure favors pollutants accumulation and sequestration in soils. We put forth the importance of the mesoporous 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.
Plan de classement
Pollution [038] ; Pédologie [068]
Description Géographique
MARTINIQUE
Localisation
Fonds IRD [F B010073750]
Identifiant IRD
fdi:010073750
Contact