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Fernandez Bayo J., Saison Carine, Voltz M., Disko U., Hofmann D., Berns A. E. (2013). Chlordecone fate and mineralisation in a tropical soil (andosol) microcosm under aerobic conditions. Science of the Total Environment, 463, 395-403. ISSN 0048-9697

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Lien direct chez l'éditeur doi:10.1016/j.scitotenv.2013.06.044

Chlordecone fate and mineralisation in a tropical soil (andosol) microcosm under aerobic conditions
Année de publication2013
Type de documentArticle référencé dans le Web of Science WOS:000325831200046
AuteursFernandez Bayo J., Saison Carine, Voltz M., Disko U., Hofmann D., Berns A. E.
SourceScience of the Total Environment, 2013, 463, p. 395-403. ISSN 0048-9697
RésuméChlordecone is a persistent organochlorine insecticide that, even decades after its ban, poses a threat to the environment and human health. Nevertheless, its environmental fate in soils has scarcely been investigated, and elementary data on its degradation and behaviour in soil are lacking. The mineralisation and sorption of chlordecone and the formation of possible metabolites were evaluated in a tropical agricultural andosol. Soil microcosms with two different soil horizons (S-A and S-B) were incubated for 215 days with C-14-chlordecone. At five different times (1, 33, 88, 150 and 215 days) the extractability of C-14-chlordecone was analysed. Mineralisation was monitored using (CO2)-C-14 traps of NaOH. The appearance of metabolites was studied using thin layer and gas chromatography techniques. At the end of the experiment, the water soluble C-14-activity was 2% of the remaining C-14-chlordecone for S-A and 8% for S-B. Only 12% of the remaining activity was non extractable and more than 80% remained extractable with organic solvents. For the first time to our knowledge, a significant mineralisation of chlordecone was measured in a microcosm under aerobic conditions (4.9% for S-A and 3.2% for S-B of the initial C-14-activity). The drastically lower emission of (CO2)-C-14 in sterilised microcosms indicated the biological origin of chlordecone mineralisation in the non-sterilised microcosms. No metabolites could be detected in the soil extracts. The mineralisation rate of chlordecone decreased by one order of magnitude throughout the incubation period. Thus, the chlordecone content in the soil remained large. This study confirms the existence of chlordecone degrading organisms in a tropical andosol. The reasons why their activity is restricted should be elucidated to allow the development of bioremediation approaches. Possible reasons are a heterogeneous distribution a chlordecone between sub-compartments with different microbial activities or a degradation of chlordecone by co-metabolic processes controlled by a limited supply of nutrients.
Plan de classementPédologie [068] ; Sciences du milieu [021] ; Pollution [038] ; Biologie du sol [074] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
LocalisationFonds IRD [F B010061223]
Identifiant IRDfdi:010061223
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010061223

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