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Poster De Conférence Année : 2021

Evaluation of the use of gastropod shells as bioindicators of metal contamination in rivers using mass spectrometry imaging techniques

Évaluation des coquilles de gastéropode en tant que bio-indicateur de la contamination métallique en rivière à l'aide des techniques d'imagerie par spectrométrie de masse

Amiel Boullemant
  • Fonction : Auteur

Résumé

Gastropod shells grow throughout their life by integrating some of the chemical elements present in their environment, including metals. Although rare studies are available, relationships have been established between the distribution of metals in the shell and that present in the ambient environment, and as a function of exposure time. The goal of this work is to evaluate the possible use of shells as a tool for biomonitoring metal concentrations in freshwater. Two mass spectrometry imaging techniques are currently optimized to explore the variability of metals in shells at different spatial scales: Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS - nanoscale) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS - micrometer scale). For this purpose, Radix balthica were collected at different sites influenced by metal input of a wastewater treatment plant (WWTP) in Pau. The chosen sites are: 1) the upstream of the WWTP, 2) the effluent of the WWTP and 3) the downstream of the WWTP which are a mixture of the effluent and the downstream. At each site, water was sampled to be analyzed for their concentrations in metals, cations, anions and dissolved organic carbon. Metal concentrations are also analyzed in the R. balthica whole shells and their soft bodies using acidic digestions. Finally, microchemical analyses of metals in the shells are performed with TOF-SIMS and LA-ICP-MS. Those measurements will allow us to check for the enrichment of the shell with metals according to metals concentrations in freshwater. The highest concentrations of Sr, Br and Mn were observed in the upstream of WWTP. But for Zn, Ni, Pb and Cu the accumulation in the shell was observed in the effluent site.
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Dates et versions

hal-03960369 , version 1 (27-01-2023)

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  • HAL Id : hal-03960369 , version 1

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Maëva Marimoutou, Gilles Bareille, Mathieu Milhe-Poutingon, Patrick Baldoni-Andrey, Amiel Boullemant, et al.. Evaluation of the use of gastropod shells as bioindicators of metal contamination in rivers using mass spectrometry imaging techniques. 47th Canadian Ecotoxicity Workshop, Oct 2021, Halifax, Canada. ⟨hal-03960369⟩
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