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Provedor de dados:  ArchiMer
País:  France
Título:  Tellurium behaviour in a major European fluvial–estuarine system (Gironde, France): fluxes, solid/liquid partitioning and bioaccumulation in wild oysters
Autores:  Gil-díaz, Teba
Schäfer, Jörg
Dutruch, Lionel
Bossy, Cécile
Pougnet, Frédérique
Abdou, Melina
Lerat-hardy, Antoine
Pereto, Clément
Derriennic, Hervé
Briant, Nicolas
Sireau, Teddy
Knoery, Joel
Blanc, Gerard
Data:  2019-07
Ano:  2019
Palavras-chave:  Garonne River
Gironde Estuary
Lot River
Technology critical element
Resumo:  Tellurium (Te) is a technology critical element (TCE) with largely unknown environmental behaviour, especially in continent-ocean interface systems. The unknown behaviour results from the lack of studies in aquatic environments and from analytical challenges limiting the determination of its naturally low (ultra-trace) environmental levels. We performed a comprehensive study of Te in the Lot–Garonne–Gironde fluvial–estuarine system to better understand seasonal variations, solid/liquid partitioning (Kd), gross fluxes, estuarine dynamics, and transfer to wild oysters at the estuary mouth. A temporal record (2014–2017) of dissolved (Ted) and particulate (Tep) Te concentrations at five sites in the Lot–Garonne River system shows little differences between sites, with average ~0.9 ng L−1 and ~50 µg kg−1 respective concentrations. Watershed Ted and Tep follow parallel seasonal patterns, which result in constant partitioning (log10 Kd ~4.75 L kg−1), with constant annual gross dissolved fluxes (~15.0 kg y−1) and variable gross particulate fluxes (from 6.50 to 140 kg y−1) entering the Gironde Estuary. Estuarine reactivity in contrasting hydrological conditions (from flood to drought) suggest that grain-size effects and/or estuarine hydrological residence times strongly affect Tep behaviour. Historical records (1984–2017) of Te in wild oysters at the estuary mouth vary from 1.33 to 2.89 µg kg−1 dry weight (d.w.), without any clear long-term trend. This study provides rare knowledge on Te environmental dynamics in aquatic systems, and suggests that, although no current anthropogenic sources were identified in the economically developed Lot-Garonne-Gironde fluvial-estuarine system, there is a non-negligible bioaccumulation in wild oysters at the estuary mouth.
Tipo:  Text
Idioma:  Inglês

Editor:  CSIRO Publishing
Relação:  info:eu-repo/grantAgreement/EC/FP7/614002/EU//SCHeMA
Formato:  application/pdf
Fonte:  Environmental Chemistry (1448-2517) (CSIRO Publishing), 2019-07 , Vol. 16 , N. 4 , P. 229-242
Direitos:  info:eu-repo/semantics/openAccess

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