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

Dang, Duc Huy; Lenoble, Véronique; Durrieu, Gaël; Omanović, Dario; Mullot, Jean-Ulrich; Mounier, Stéphane; Garnier, Cédric (2015) Seasonal variations of coastal sedimentary trace metals cycling: insight on the effect of manganese and iron (oxy)hydroxides, sulphide and organic matter. Marine Pollution Bulletin, 92 (1/2). pp. 113-124. ISSN 0025-326X

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Abstract

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 (0–5 cm 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.

Item Type:	Article
Additional Information:	This study was performed in the framework of CARTOCHIM and CARTOC research programs (funded by ‘‘Toulon-Provence- Méditerranée (TPM)’’, the ‘‘Région PACA’’, and ‘‘l’Agence de l’Eau Rhône-Méditerranée et Corse’’) and erMex-WP3-C3A research program (part of the international IMBER project). The authors thank the French Navy for diving and sampling assistance, Dr. B. Oursel for sampling.
Uncontrolled Keywords:	trace metals cycling; coastal sediments; organic matter; Sulphide, modelling; seasonal variations
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division for Marine and Enviromental Research
Depositing User:	Dario Omanović
Date Deposited:	15 Dec 2016 12:43
URI:	http://fulir.irb.hr/id/eprint/3133
DOI:	10.1016/j.marpolbul.2014.12.048

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