HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Long-term pollution by chlordecone of tropical volcanic soils in the French West Indies: New insights and improvement of previous predictions

Abstract : Chlordecone (CLD), was widely applied in banana fields in the French West Indies from 1972 to 1993. The WISORCH model was constructed to assess soil contamination by CLD and estimated that it lasts from 100 to 600 years, depending on leaching intensity and assuming no degradation. However, recent studies demonstrated that CLD is degraded in the environment, hence questioning the reliability of previous estimations. This paper shows how to improve the model and provides insights into the long-term dissipation of CLD. In-situ observations were made in nearly 2545 plots between 2001 and 2020, and 17 plots were sampled at two dates. Results of soil analyses showed an unexpected 4-fold decrease in CLD concentrations in the soil, in contrast to simulations made using the first version of WISORCH at the time. Neither erosion, nor CLD leaching explained these discrepancies. In a top-down modeling approach, these new observations of CLD concentrations led us to implement a new dissipation process in the WISORCH model that corresponds to a DT50 dissipation half-life of 5 years. The new version of the improved model allowed us to update the prediction of the persistence of soil pollution, with soil decontamination estimated for the 2070s. This development calls for re-evaluation of soil pollution status. Further validation of the new version of WISORCH is needed so it can contribute to crop management on contaminated soil.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03600587
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Monday, March 7, 2022 - 4:27:50 PM
Last modification on : Saturday, May 21, 2022 - 3:41:34 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2022-09-07

Please log in to resquest access to the document

Identifiers

Citation

Irina Comte, Alice Pradel, Armand Crabit, Charles Mottes, Lai Ting Pak, et al.. Long-term pollution by chlordecone of tropical volcanic soils in the French West Indies: New insights and improvement of previous predictions. Environmental Pollution (Elsevier), 2022, 303, pp.119091. ⟨10.1016/j.envpol.2022.119091⟩. ⟨insu-03600587⟩

Share

Metrics

Record views

95