Evaluation of diffusive gradients in thin films (DGT) technique for speciation of trace metals in estuarine waters - A multimethodological approach

Autor: Véronique Lenoble, Neven Cukrov, Dario Omanović, Cédric Garnier, Benjamin Oursel, Ana-Marija Cindrić, Saša Marcinek, Pascal Salaün
Přispěvatelé: Rudjer Boskovic Institute [Zagreb], Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), School of Environmental Sciences [Liverpool], University of Liverpool, Rudjer Boskovic Institute, Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Environmental Engineering
010504 meteorology & atmospheric sciences
media_common.quotation_subject
010501 environmental sciences
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
01 natural sciences
Metal
[CHIM.ANAL]Chemical Sciences/Analytical chemistry
Environmental Chemistry
Trace metal
Marine Science
14. Life underwater
Waste Management and Disposal
bioavailability
trace metals
stratified estuary
Krka River estuary
diffusive gradients in thin films (DGT)
speciation modelling
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
media_common
geography
geography.geographical_feature_category
Chemistry
Estuary
Contamination
Pollution
Diffusive gradients in thin films
6. Clean water
Bioavailability
Speciation
Anodic stripping voltammetry
13. Climate action
visual_art
Environmental chemistry
[SDE]Environmental Sciences
visual_art.visual_art_medium
Zdroj: Science of the Total Environment
Science of the Total Environment, 2020, 721, pp.137784. ⟨10.1016/j.scitotenv.2020.137784⟩
Science of The Total Environment
Science of the Total Environment, Elsevier, 2020, 721, pp.137784. ⟨10.1016/j.scitotenv.2020.137784⟩
ISSN: 0048-9697
1879-1026
DOI: 10.1016/j.scitotenv.2020.137784⟩
Popis: Understanding the potential bioavailability of trace metals (TM) in marine systems is of prime importance to implement adapted regulations and efficiently protect our coastal and estuarine waters. In this study Diffusive Gradients in Thin films (DGT) technique with two different pore size was used to evaluate the potentially bioavailable fractions (DGT- labile) of Cd, Co, Cu, Ni, Pb and Zn at various depths of a highly stratified estuary (the Krka River estuary, Croatia) both in winter and summer. DGT-labile concentrations were compared to (1) total dissolved concentrations, (2) concentrations of labile species measured by anodic stripping voltammetry (ASV-labile) for Cu and (3) concentrations derived by chemical speciation modelling. High correlation between dissolved and DGT- labile concentrations was found for all metals, except for Zn where contamination problems prevented reliable conclusions. Percentages of DGT- labile fractions over total dissolved concentrations were (AVG ± SD): 92 ± 3%, 64 ± 2%, 23 ± 5%, 61 ± 3% and 57 ± 6% for Cd, Pb, Cu, Ni and Co, respectively. No significant difference was found between trace metal concentrations measured with an open pore and restricted pore devices, implying the predominance of kinetically labile metal complexes smaller than 1 nm. For Cu, ASV-labile and DGT labile concentrations were highly correlated (0.97) with ASV-labile concentration being around 35% lower than that of the DGT-labile. Modelling of chemical speciation reliably predicted dynamic (free, inorganic and part of organic complexes) concentration of Cd, whereas dynamic concentrations of Cu and Pb were underestimated by 32% and 65%, respectively. In view of the relative simplicity of DGT devices, they are well suited for the monitoring effort of coastal waters, informing on potentially bioavailable concentrations of TM and thereby, helping to achieve good environmental status of coastal waters, as stipulated within the EU Water Framework Directive.
Databáze: OpenAIRE
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