Seasonal variations of coastal sedimentary trace metals cycling: Insight on the effect of manganese and iron (oxy)hydroxides, sulphide and organic matter

•Multivariate statistic treatment (PCA) classified main elements and samples groups.•Trace metals mobility in porewater showed seasonal variations.•Strong control of Fe and Mn on metals dynamics at surface sediments.•Influence of dissolved organic matter on metal-sulphide equilibrium. The combinatio...

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Bibliographic Details
Published in:Marine pollution bulletin 2015-03, Vol.92 (1-2), p.113-124
Main Authors: Dang, Duc Huy, Lenoble, Véronique, Durrieu, Gaël, Omanović, Dario, Mullot, Jean-Ulrich, Mounier, Stéphane, Garnier, Cédric
Format: Article
Language:English
Subjects:
Coastal sediments
Environment and Society
Environmental Sciences
Geologic Sediments - chemistry
Hydroxides - analysis
Hydroxides - chemistry
Iron - analysis
Iron - chemistry
Manganese - analysis
Marine
Metals - analysis
Metals - chemistry
Modelling
Models, Theoretical
Organic matter
Seasonal variations
Seasons
Sulfides - analysis
Sulfides - chemistry
Sulphide
Trace metals cycling
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
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Summary:•Multivariate statistic treatment (PCA) classified main elements and samples groups.•Trace metals mobility in porewater showed seasonal variations.•Strong control of Fe and Mn on metals dynamics at surface sediments.•Influence of dissolved organic matter on metal-sulphide equilibrium. The combination of analysis, multivariate treatment (PCA) and chemical speciation calculation confirmed the control of Fe, Mn, sulphide and organic matter on metals dynamics in coastal sediments (0–5cm surface sediments and sediments cores) of Toulon Bay (NW Mediterranean). The temporal monitoring of the physic-chemical parameters as well as the dissolved/particulate minor (Fe/Mn) and trace elements (i.e. Ag, Cd, Co, Cu, Ni, Pb, Zn, …) concentrations in porewaters and sediments were assessed. Multivariate treatment revealed different behaviours for marine elements, terrestrial ones and contaminants. Seasonal variations of metals mobilization in porewater were observed, related to diagenesis activity. Element mobility was studied by selective extractions (ascorbate, acid and alkaline) on sediments. Thermodynamic simulation (PHREEQC) was performed to calculate the elemental dissolved speciation, the mineral saturation index and then to simulate the solid/liquid interaction through precipitation processes, studying the contrasted influence of dissolved organic matter and sulphide.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2014.12.048