Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Crop protection and environmental health : legacy management and new concepts Environmental Science and Pollution Research Colloque Annuel du Groupement Français des Pesticides (GFP) 81-97 Kepone Curlone Pesticides Banana Martinique Hierarchical Bayesian modelling Data censoring MARTINIQUE 2016 2014/05/26-29 fdi:010066130 ENG Environmental Science and Pollution Research 0944-1344 ISI:000368199300010 1 https://www.documentation.ird.fr/hor/fdi:010066130 https://www.documentation.ird.fr/intranet/publi/2016/02/010066130.pdf 23 Horizon (IRD) Chlordecone (CLD) was an organochlorine insecticide whose previous use resulted in an extensive pollution of the environment with severe health effects and social consequences. A closely related compound, 5b-hydrochlordecone (5b-hydroCLD), has been searched for and often detected in environmental matrices from the geographical area where CLD was applied. The current consensus considered that its presence was not the result of a biotic or abiotic dechlorination of CLD in these matrices but rather the consequence of its presence as impurity (synthesis by-product) in the CLD released into the environment. The aim of the present study was to determine if and to what extent degradation of CLD into 5b-hydroCLD occurred in the field. To test this hypothesis, the ratios of 5b-hydroCLD and CLD concentrations in a dataset of 810 soils collected between 2006 and 2012 in Martinique were compared to the ratios measured in 3 samples of the CLD dust commercial formulations applied in the banana fields of French West Indies (FWI) and 1 sample of the technical-grade CLD corresponding to the active ingredient used in such formulations. Soil data were processed with a hierarchical Bayesian model to account for random measurement errors and data censoring. Any pathway of CLD transformation into 5b-hydroCLD occurring over the long term in FWI soils would indeed change the ratio of 5b-hydroCLD/CLD compared to what it was in the initially applied formulations. Results showed a significant increase of the 5b-hydroCLD/CLD ratio in the soils-25 times greater in soil than in commercial formulations-which suggested that natural CLD transformation into 5b-hydroCLD over the long term occurred in these soils. Results from this study may impact future decisions for the remediation of the polluted areas. 068 ; 076 ; 038 ; 020 UR237