FENG, Caiyan; PEDRERO, Zoyne; GENTES, Sophie; BARRE, Julien; RENEDO, Marina; TESSIER, Emmanuel; BERAIL, Sylvain; MAURY-BRACHET, Regine; MESMER-DUDONS, Nathalie; BAUDRIMONT, Magalie; LEGEAY, Alexia; MAURICE, Laurence; GONZALEZ, Patrice; AMOUROUX, David

doi:10.1021/acs.est.5b03587

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FENG, Caiyan

PEDRERO, Zoyne

GENTES, Sophie
Environnements et Paléoenvironnements OCéaniques [EPOC]

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Environmental Science and Technology. 2015-09-23, vol. 49, n° 21, p. 12984-12993

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An original approach is proposed to investigate inorganic (iHg) and methylmercury (MeHg) trophic transfer and fate in a model fish, Danio rerio , by combining natural isotopic fractionation and speciation. Animals were exposed to three different dietary conditions: i. 50 ng Hg g-1, 80% as MeHg; ii. diet enriched in MeHg 10000 ng Hg g-1, 95% as MeHg and iii. diet enriched in iHg 10000 ng Hg g-1, 99% as iHg. Harvested was carried out after 0, 7, 25 and 62 days. Time-dependent Hg species distribution and isotopic fractionation in fish organs (muscle, brain, liver) and faeces, exhibited different patterns, as a consequence of their dissimilar metabolization. The rapid isotopic re-equilibration to the new MeHg-food source reflects its high bioaccumulation rate. Relevant aspects related to Hg excretion are also described. This study confirms Hg isotopic fractionation as a powerful tool to investigate biological processes, although its deconvolution and fully understanding is still a challenge.< Réduire

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Specific Pathways of Dietary Methylmercury and Inorganic Mercury Determined by Mercury Speciation and Isotopic Composition in Zebrafish (Danio rerio)

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