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STUDIES OF THE DOM AQUEOUS EXTRACTS FROM COASTAL MARINE SEDIMENTS. F. Sakellariadou. Lab. of Oceanography and Marine Geochemistry, Dept of Maritime Studies, University of Piraeus, 21 Gr. Lambraki & Distomou st, Piraeus 18532, Greece, email: [email protected] Present study :
Lab. of Oceanography and Marine Geochemistry, Dept of Maritime Studies, University of Piraeus,
21 Gr. Lambraki & Distomou st, Piraeus 18532, Greece, email: [email protected]
represents a major exchangeable organic pool playing an outstanding role in the ocean carbon cycle.
has a complex chemical structure made up of a wide range of organic molecules.
has a composition that depends on the sources proximity and
the exposure to any sort of degradation mechanism.
interacts with pollutants either by enhancing their bioavailability or
by influencing their transportation to the soluble phase.
affects the remineralisation of carbon and its preservation in marine sediments.
has a terrestrial, freshwater or marine origin.
Map of Greece, with ▲ is shown the study area.
Map of the study area with the sampling sites.
All fluorescence spectra were thoroughly evaluated for the classification of chromophoric units present.
Variations were observed according to:
► the sampling site and more precisely its proximity to the coastline and the corresponding water column’s depth;
► the oceanographic characteristics allowing or obstructing sea water circulation;
► the proximity of each sample to the seabed, in other words the characterization of each sediment sample as surface of subsurface one.
Mono dimensional emission spectra.
Synchronous scan excitation spectra.
Selected EEM (3D) spectra.
 Burdige, D.J., Kline, S.W., Chen, W., 2004. Fluorescent dissolved organic matter in marine sediment pore waters. Marine Chemistry, 89, 289-311.  Ohno, T. 2002. Fluorescence inner-filtering correction for determining the humification index of dissolved organic matter. Environ. Sci.and Technol., 36, 742-746.  Zsolnay,A., Baigar, E., Zimenez, M., Steinweg, B., Saccomandi, F., 1999. Differetiating with fluorescence spectroscopy the sources of dissolved organic matter in soils subjected to drying. Chemosphere 38:45-50.  Cobble, P.G., 1996. Characterisation of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy. Marine Chemistry51:325-346.  Senesi, N., Miano, T.M., Provenzano, M.R., and Brunetti, G., 1991. Characterization, differentiation, and classification of humic substances by fluorescence spectroscopy. Soil Science 152(4): 259-271.
European Geosciences Union, General Assembly 2012, 22-27 April 2012. Vienna, Austria