The Speciation and Mobility of Mn and Fe in Estuarine Sediments

Dissolved and solid-phase speciation of Mn and Fe was measured in the porewaters of sediments recovered from three sites in the Greater St. Lawrence Estuary: the Saguenay Fjord, the Lower St. Lawrence Estuary (LSLE) and the Gulf of St. Lawrence (GSL). At all sites and most depths, metal organic liga...

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Bibliographic Details
Published in:Aquatic geochemistry 2019-04, Vol.25 (1-2), p.3-26
Main Authors: Oldham, Véronique E., Siebecker, Matthew G., Jones, Matthew R., Mucci, Alfonso, Tebo, Bradley M., Luther, George W.
Format: Article
Language:English
Subjects:
Benthos
Brackishwater environment
Coordination compounds
Diffusion layers
Diffusion rate
Earth and Environmental Science
Earth Sciences
Estuaries
Estuarine dynamics
Fjords
Fluxes
Geochemistry
Heavy metals
Hydrogeology
Hydrology/Water Resources
Iron
Manganese
Mud-water interfaces
Organic matter
Oxidation
Oxidation rate
Oxides
Pore water
Sediment
Sediments
Solid phases
Speciation
Stabilizing
Water Quality/Water Pollution
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Summary:Dissolved and solid-phase speciation of Mn and Fe was measured in the porewaters of sediments recovered from three sites in the Greater St. Lawrence Estuary: the Saguenay Fjord, the Lower St. Lawrence Estuary (LSLE) and the Gulf of St. Lawrence (GSL). At all sites and most depths, metal organic ligand complexes (Mn(III)–L and Fe(III)–L) dominated the sedimentary porewater speciation, making up to 100% of the total dissolved Mn or Fe. We propose that these complexes play a previously underestimated role in maintaining oxidized soluble metal species in sedimentary systems and in stabilizing organic matter in the form of soluble metal–organic complexes. In the fjord porewaters, strong (log K COND  > 13.2) and weak (log K COND  
ISSN:1380-6165
1573-1421
DOI:10.1007/s10498-019-09351-0