Comparison of efficiency of in situ amendment of soil and alimentary supplementation with activated carbons to limit CLD transfer to piglets

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Delannoy, Matthieu | Yehya, Sarah | Fournier, Agnès | Baroudi, Moumen | Rychen, Guido | Feidt, Cyril

Edité par CCSD -

PRINT ISSN 2309-8031 - ONLINE ISSN 2310-3043 © 2017. International audience. Chlordecone (Kepone) (CLD) is a highly persistent pesticide formerly used in French West Indies. Nowadays high levels of this pesticide are still found in soils and represent a subsequent source of contamination for outdoor-reared animals. In that context, sequestering matrices such as activated carbons (ACs) are believed to efficiently decrease the bioavailability of such compounds. The present study intends to test the respective efficiency of two sequestering strategies using ACs in the animal production context: (i) ACs supplemented to feed or (ii) ACs as a soil amendment. This study involved 20 piglets randomly distributed into 5 experimental groups (4 replicates). All of them were exposed through one artificial soil to 10 µg of CLD per kg of BW. This soil was amended by 2% (mass basis) of either ORBO and DARCO, the two ACs tested, and given to 2 experimental groups. Two other groups were given additionally a feed containing 0.5% (mass basis) of one of the ACs. Only the experimental groups exposed through amended soil with one of the two ACs presented a significant decrease of concentrations of CLD in liver and adipose tissue in comparison with the control group (p< 0.001). This decrease was particularly high for a coconut shell activated carbon (ORBO) where relative bioavailability was found to be lower than 1.8% for both tissues. Overall, AC introduced in CLD contaminated soil has thye potential to strongly reduce CLD bioavailability whereas sequestration of CLD during digestive processes via supplemented feed was not efficient.

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