Abstract
Trace metals (Al, Pb, Zn, Cr, Cu, Ni, Fe, Mn) were studied in waters (dissolved and particulate phases) and sediments of the Louros Estuary in the Amvrakikos Gulf, one of the most important European wetlands located at the NW coast of Greece.
The study system is small, with a relatively narrow mixing zone, typical for Mediterranean estuaries. Particular emphasis was given to understanding the conditions prevailing in summer. During this season saline water intrudes the estuary along the river bed, despite the existing shallow sill, and forms a thin salt-wedge water mass, which occupies the near bottom layer with its thin end pointed upstream.
Particulate metal concentrations within this saline bottom layer are considerably higher than in the riverine and marine sections of the estuary. Since the metal content of particles collected upstream is higher than that of the marine ones, there is a clear evidence that the salt-wedge acts as a ‘sink’ for most metals during the summer.
Coexistance in the same zone of high dissolved metal concentrations indicate that loosely associated metals are desorbed from riverine particles, whereas newly formed suspended matter is deposited together with particles, transported by the river. The accumulation of metals in the near bottom layer affects directly their distribution in the sediments. The maximum concentrations of the metal fraction which is loosely held in sediments, are found primarily at the same site. The distribution of the ‘non-labile’ metal fraction of the sediments (particularly for Cu and Pb) is broadly constant throughout the estuary, confirming the absence of any significant natural or industrial point sources, at the lower part of the river.
However, the analysis of sediment cores reveals an enrichment of this metal fraction at the top, near surface sections of the mouth area, indicating relatively recent pollution.
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References
Agemian, F. and Chau, A. S. Y.: 1976, Analyst 101, 761–767.
Boyle, E. A., Edmond, J. M. and Sholkovicz, E. R.: 1977, Geochim. Cosmochim. Acta 41, 1313–1326.
Branica, M., Kwokal, Z., Peharec, Z., Martincic, D., Pizeta, J. and Zelic, M.: 1989, in Abstracts of the 1st Int. Symposium on Small Estuaries, Primosten, Yugoslavia, May 21–27, pp. 46–47.
Dorten, W. S., Elbaz-Poulichet, F., Mart, L. R. and Martin, J. M.: 1991, Ambio 20, 1, 2–6.
Duinker, J. C.: 1980, in Olausson E. and Cato, I. (eds.), Chemistry and Biochemistry of Estuaries, John Wiley and Sons, New York, pp. 121–125.
Dyer, K. R.: 1972, in Barnes R. S. K and Green, J. (eds.), The Estuarine Environment, Applied Science Publications, London, pp. 10–32.
Eaton, A.: 1979, Estuarine Coastal and Marine Science 9, 41–49.
Elbaz-Poulichet, F., Guan, D. M. and Martin, J. M.: 1991, Marine Chemistry 32, 211–224.
Förstner, U. and Salomons, W.: 1980, Environ. Techn. Lett. 1, 494–505.
Gaudette, H. E., Flight, W., Tones, L. and Folger, D.: 1974, Journal of Sedimentary Petrology 44, 249–253.
Goldberg, E. D., Griffin, J. J., Hodge, V., Koide, M. and Windom, H.: 1979, Environmental Science and Technology 13, 588–594.
Grant Gross, M.: 1977, in Oceanography, A View of the Earth, 2nd ed., Prentice-Hall Inc., Englewood Cliffs, N. Jersey, pp. 265–269.
IAEA/AL/053, IAEA/MEL/49, SD-M-2/TM: 1991, Worldwide Intercomparison of Trace Element Measurements in Marine Sediments. UNEP report no. 49, L.D. Mee and P. Oregioni (eds.)
Kousouris, Th., Diapoulis, A., Bertahas, E. and Kritzalis, K.: 1989, in Proceedings of the Conferene on Environmental Science and Technology, Aegean University, Mytilini, Greece, pp. 300–309.
Mackereth, F. J. H.: 1969, Limnology Oceanography 14, 145.
Martin, J. M. and Gordeev, V.: 1986, in Estuarine Processes: An Application to the Tagus Estuary, Proceedings of a UNESCO/IOC/CNA Workshop, held at Palazio Foz, Lisbon, Portugal, December 1982, pp. 193–202.
Mayer, L. M.: 1982, Geochimica, Cosmochimica Acta 46, 2527–2535.
Morris, A. W.: 1986, The Science of the Total Environment 49, 297–304.
Riley, J. P. and Taylor, D.: 1968, Analytica Chimica Acta 40, 479.
Schropp, S. J. and Windom, H. L. (eds.): 1988, A Guide to the Interpretation of Metal Concentrations in Estuarine Sediments, ICES, Report of the working group on marine sediment in relation to pollution, Annex 5, CM 1988/E 25.
Scoullos, M.: 1981, Water, Air and Soil Pollution 16, 187–207.
Scoullos, M. and Dassenakis, M.: 1984, in Proceedings of the First Greek Symposium on Oceanography and Fisheries, National Center for Marine Research, Athens, pp. 302–309.
Scoullos, M.: 1986, The Science of the Total Environment 49, 199–219.
Scoullos, M. and Oldfield, F.: 1986, Marine Chemistry 18, 249–268.
Scoullos, M., Dassenakis, M., Zeri, C., Rapti, M. and Papageorgiou, K.: 1989, Project report on the sediments of Acheloos estuary — Patraikos Gulf, Louros estuary — Amvrakikos Gulf, Spherios estuary-Maliakos Gulf, Gulf of Elefsis. Ministry of Industry, Research and Technology, Programme YVET/ERE 1632.
Scoullos, M., Dassenakis, M., Zeri, C., Papageorgiou, K. and Dagre, P.: 1990a, Rapp. Comm. Int. Met. Medit. 32, 1, 54.
Scoullos, M., Dassenakis, M., Zeri, C. and Rapti, M.: 1990b, Rapp. Comm. Int. Mer. Medit. 32, 1, 54.
Sholkovitz, E. R., Boyle, E. D, and Price, N. B.: 1978, Earth and Planetary Science Letters 40, 130–136.
Sinex, S. A., Cantillo, A. Y. and Helz, G. R.: 1980, Anal. Chem. 52, 2342–2346.
Stumm, W. and Lee, G. F.: 1960, Schweizer Zeitung Hydrologia 21, 295–319.
Trefry, J. H., Metz, S. and Trocine, R. P.: 1985, Science 230, 439–441.
UNEP: 1989, State of the Mediterranean Marine Environment, MAP Techn. Rep. Series No. 28, pp. 132–136.
Voutsinou-Taliadouri, F.: 1989, in Proceedings of the Conference on Environmental Science and Technology, Aegean University, Mytilini, Greece, pp. 261–270.
Wollast, R., Billen, G. and Duinker, J. C.: 1979, Estuarine Coastal and Marine Science 5, 71–80, 33.
Ziogas, G., Stamoulakis, G., Constandis, K. and Kalfacacou, B.: 1982, Pollution and Environmental Problems in Ioannina Area, Greece, Technical Report TEETH, 144.
Zutic, V. and Legovic, T.: 1987, Nature 328, 612–614.
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Scoullos, M., Dassenakis, M. & Zeri, C. Trace metal behaviour during summer in a stratified Mediterranean system: The Louros Estuary (Greece). Water Air Soil Pollut 88, 269–295 (1996). https://doi.org/10.1007/BF00294106
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DOI: https://doi.org/10.1007/BF00294106