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Identifier uch.biology.msc//1993vlachonis
Title Μελέτη συγκέντρωσης βαρέων μετάλλων στα θαλάσσια ιζήματα του κόλπου του Ηρακλείου (Β. Κρήτη)
Author Βλαχώνης, Γιώργος
Abstract In order to estimate the degree of contamination in the marine environment of the Gulf of Heraklion, 64 surface sediment samples (0-2 cm) were taken from a Smith-McIntyre grab at depths between 10 and 100 m. The R/V "FILIA" of the Institute of Marine Biology of Crete was used for sampling the sediment. The redox potential (Eh) and the temperature of the sediments were measured on board. In the laboratorythe particulate organic carbon (POC) was determined and the particle size analysis of the sediment samples was performed. The sediment samples were analysed for copper, zinc, lead, cadmium and mercury (total concentrations) by means of the Graphite Furnace Atomic Absorption Spectrometric method and cold vapor method (for mercury). Statistical methods (correlation, ANOVA, t-test) were performed in order to evaluate any significant differences between metal concentrations and to detect the possible parameter effects. The silt & clay content of the surface sediments of the Gulf of Heraklion was increased with the depth especially at stations deeper than 30m. The surface sediments were generally well oxydized but at depths of 30 and 40 m the Eh values were significantly degreased. The POC concentrations were increased with the depth revealing a very good positive correlation with the % silt & clay. Allthough the heavy metal concentartions of the sediments were relatively low, significant increase were found in certain areas of the gulf showing possible contamination sources. The sediments near the power station had high concentrations of copper, while lead, mercury and cadmium content was increased at stations near the city of Heraklion and the industrial zone. High copper and zinc concentrations were also found in sediment samples with low Eh-values and lead seems to correlate positively with the silt & clay content of the sediment. Cadmium and mercury values were very low in the sediments, but they were found higher at shallower stations, reaviling hot-spot areas in the Gulf of Heraklion.
Language Greek
Issue date 1993-09-01
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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