Data/hora: 12/06/2024 12:02:24

Provedor de dados: 	5	
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; RNO; ROCCH; 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	
Identificador: 	https://archimer.ifremer.fr/doc/00505/61684/65639.pdf

DOI:10.1071/EN18226

https://archimer.ifremer.fr/doc/00505/61684/	
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	
Fonte: 	info:eu-repo/semantics/openAccess

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