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Woignier T, Clostre F, Fernandes P, Soler A, Rangon L, Sastre-Conde MI, Jannoyer ML. The pesticide chlordecone is trapped in the tortuous mesoporosity of allophane clays. Environ Sci Pollut Res Int 2018; 25:21350-21361. [PMID: 28577145 DOI: 10.1007/s11356-017-9370-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 05/23/2017] [Indexed: 06/07/2023]
Abstract
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.
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Affiliation(s)
- Thierry Woignier
- Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (IMBE), Aix Marseille Université, CNRS, IRD, Avignon Université, 13397, Marseille Cedex 20, France.
- IRD, UMR IMBE, Campus Agro Environnemental Caraibes B. P. 214 Petit Morne, 97235, Le Lamentin, Martinique.
| | - Florence Clostre
- Cirad, UPR fonctionnement agroécologique et performances des systèmes de culture horticoles, Campus Agro Environnemental Caraïbes B.P. 214 Petit Morne, 97232, Le Lamentin, Martinique
| | - Paula Fernandes
- Cirad, UPR fonctionnement agroécologique et performances des systèmes de culture horticoles, Campus Agro Environnemental Caraïbes B.P. 214 Petit Morne, 97232, Le Lamentin, Martinique
- Cirad UR HortSys, TA B-103/PS4, Boulevard de la Lironde, 34398, Montpellier Cedex5, France
| | - Alain Soler
- Cirad UR Banana, plantain and pinneapple cropping system, Campus Agro Environnemental Caraïbes B.P. 214 Petit Morne, 97232, Le Lamentin, Martinique
| | - Luc Rangon
- Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (IMBE), Aix Marseille Université, CNRS, IRD, Avignon Université, 13397, Marseille Cedex 20, France
- IRD, UMR IMBE, Campus Agro Environnemental Caraibes B. P. 214 Petit Morne, 97235, Le Lamentin, Martinique
| | | | - Magalie Lesueur Jannoyer
- Cirad, UPR fonctionnement agroécologique et performances des systèmes de culture horticoles, Campus Agro Environnemental Caraïbes B.P. 214 Petit Morne, 97232, Le Lamentin, Martinique
- Cirad UR HortSys, TA B-103/PS4, Boulevard de la Lironde, 34398, Montpellier Cedex5, France
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