Reduction of chlordecone environmental availability by soil amendment of biochars and activated carbons
| Autor: | Ranguin, Ronald, Jean-Marius, Corine, Yacou, Christelle, Jeanne-Rose, Valerie, Gaspard, Sarra, Feidt, Cyril, Rychen, Guido, Delannoy, Matthieu |
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| Přispěvatelé: | DELANNOY, Matthieu, Stratégies innovantes pour sécuriser les systèmes d'élevage dans les zones contaminées par la chlordécone. Une approche modèle développée dans les Antilles et applicable dans les zones contaminées à l'échelle mondiale - - INSSICCA2016 - ANR-16-CE21-0008 - AAPG2016 - VALID, SEGH |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
[SDV] Life Sciences [q-bio]
[SDV.SA.AGRO] Life Sciences [q-bio]/Agricultural sciences/Agronomy [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition [SDV.TOX.TCA] Life Sciences [q-bio]/Toxicology/Toxicology and food chain [SDV.BA.MVSA] Life Sciences [q-bio]/Animal biology/Veterinary medicine and animal Health [SDE.IE] Environmental Sciences/Environmental Engineering [SDV.SA.SPA] Life Sciences [q-bio]/Agricultural sciences/Animal production studies [SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study [SDV.SA.ZOO] Life Sciences [q-bio]/Agricultural sciences/Zootechny |
| Popis: | Chlordecone (Kepone or CLD) was formerly used in French West Indies as an insecticide. Despite its formal ban in 1993, high levels of this pesticide are still found in soils. Sequestering matrices like biochars or activated carbons (ACs) may decrease the bioavailability of halogenated compounds like CLD when added to contaminated soils. The present study intends (i) to produce contrasted sequestering matrices in order to (ii) assess their respective efficiency to reduce CLD environmental availability. This study involved two experimental steps. The first one consisted in the production of contrasted sequestering media (Biochars and ACs) using pyrolysis and distinct activation processes on two lignocellulosic precursors: oak wood (Quercus ilex) and coconut shell (Cocos nucifera). The chemical activation was made with phosphoric acid and physical activation with carbon dioxide and steam. Their physico-chemical properties were then characterized. In the second step, the CLD environmental availability was assessed either in an OECD artificial soil or in an Antillean contaminated nitisol (2.1 µg CLD per g of soil Dry Matter) amended with 5% of biochar or 5% of AC (mass basis). Main characteristics for coconut and oak biochars and ACs determined by nitrogen adsorption at 77K shows that mixed microporous and mesoporous structures (ranging from 30 % to 70%), high pore volume (ranging from 0.38 cm3.g-1 to 2.00 cm3.g-1) and a specific (BET) surface areas from 299.9 m2.g-1 to 1285.1 m2.g-1 resp. The amendment by lignocellulosic biochars did not limit CLD environmental availability in contrast to ACs which resulted in a significant reduction of the environmental availability in both artificial and natural soils. Thus, ACs amendment reduced CLD-transfer by at least 65% (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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