Distribution of Organochlorine Pesticides and Heavy Metals in Lebanese Agricultural Soil: Case Study—Plain of Akkar

International audienc

Application of Continuous Column Adsorption of Organochlorine Pesticides from Contaminated Water onto Date Stones Activated Carbon

International audienc

Modification of the pollen lipid fraction by ozone

International audienc

Assessment of pesticide contamination in Akkar groundwater, northern Lebanon

International audienc

New Imidazole Compounds Derived from Pyrrolidonic and Piperidonic Acids as NON-Steroidic Aromatase Inhibitors

International audienc

Uptake of ozone and modification of lipids in Betula Pendula pollen

International audienc

Activated carbon, a useful medium to bind chlordecone in soil and limit its transfer to growing goat kids

Chlordecone (Kepone) (CLD) is a highly persistent pesticide which was extensively used in the French West Indies; high levels of CLD can still currently be found in large agricultural areas. As CLD transfers from soil to animals mainly via involuntary ingestion, the consumption of foodstuffs derived from animals raised in contaminated areas may significantly contribute to exposure of humans to CLD. The present study was designed to test the efficacy of two different activated carbons (ACs) sources in limiting CLD transfer from soil to animal. Three soils (ASs) were prepared according to the OECD guideline 207. One standard soil (SS) lacking AC, and two modified preparations of SS supplemented with 2% coconut-based activated carbon (ORBO), SSO or with 2% lignite-based one (DARCO), SSD. All three soils were spiked with 10 μg of kepone per g of dry matter and aged for three weeks. This study involved 15 goat kids randomly assigned to the 3 experimental groups (n = 5/group), which were fed the experimental matrices at an exposure dose of 10 μg CLD per kg of body weight per day. After 21 d of oral exposure, CLD in adipose tissue and liver were analysed by LC-MS-MS. A significant decrease of 63.7% and 74.7% of CLD concentrations in adipose tissue and liver, respectively, were obtained from animals exposed using SS containing DARCO as compared to those receiving only SS. Decreases in CLD levels of 98.2% (adipose tissue) and 98.7% (liver) were obtained for animals exposed using SS containing ORBO. This study leads us to conclude that (i) the presence of AC in CLD-contaminated soil strongly reduces CLD bioavailability, and (ii) the efficacy depends on the nature and characteristics of the AC used

Organochlorine POPs sequestration strategy by carbonaceous amendments of contaminated soils: Toward a better understanding of the transfer reduction to laying hens

International audiencePCBs, PCDD/Fs, and Chlordecone (CLD) are POPs found in soils and transferred to animals through involuntary soil ingestion. In this frame, the amendment of contaminated soil with porous matrices, like Biochars (BCs) and Activated Carbons (ACs), is a promising technique for reducing this transfer. In this study, the efficiency of 3 biochars and 3 activated carbons was assessed by amending 2% (by weight) of these matrices on (i) CLD or (ii) PCBs and PCDD/Fs contaminated artificial soils. Porosity of the carbon-based materials and molecules physico-chemical characteristics were then linked to the obtained results. The concentrations of pollutants were then measured in the egg yolks of laying hens (n = 3), which were fed on a daily basis pellets containing 10% of soil for 20 days. Overall, no significant transfer reduction was observed with the biochar and the granular AC amendments for all the compounds. However, significant reductions were obtained with the two efficient activated carbons for PCDD/Fs and DL-PCB up to 79-82% (TEQ basis), whereas only a slight reduction of concentrations was obtained with these activated carbons for CLD and NDL-PCBs. Thus, (i) biochars were not proven efficient to reduce halogenated pollutants transfer to animals, (ii) powdered AC amendments resulted in reducing the bioavailability of soil POPs, and (iii) the effectiveness of such strategy depended on both characteristics of the matrix and of the pollutants.---- UNTIL 03 June 2022 the article is freely provided by elsevier through the following link : https://authors.elsevier.com/a/1evmO15DSlNq5

Concentrations of CLD in biological matrices (ng of CLD per g of DM).

<p>Concentrations of CLD are expressed in ng.g^-1 of DM. Values correspond to the mean ± SD. Mean values with different superscript letters (a, b, c) were statistically different (P<0.05). Statistical analysis was performed using the two-way ANOVA procedure of R software and a Tukey post-hoc test. Two effects were used in the model: Organ and Treatment. Both effects were significant (p<0.0001) and RMSE = 12.84. (n = 5). RMSE: Root means square error. #: values are below limit of quantification (LOQ).</p

Reduction factor (%, based on 95th confidence interval).

<p>Reduction factor (%, based on 95th confidence interval).</p