E-Locus - Institutional Repository of the University of Crete

Home Search

Results - Details

Search command : Author="Περγαντής" And Author="Σπυρίδων"

Current Record: 11 of 56

[Add to Basket]

Identifier

000450086

Title

Εποχική μελέτη της κατανομής των συγκεντρώσεων βαρέων μετάλλων στην ηπειρωτική υφαλοκρηπίδα του κόλπου του Ηρακλείου, Κρήτη, Ανατολική Μεσόγειος

Alternative Title

Seasonal study of heavy metal concentrations in the continental shelf sediments of Heraklion bay, Crete Island, Eastern Mediterranean

Author

Χρυσού, Ελευθερία Ζ.

Thesis advisor

Περγαντής, Σπυρίδων

Reviewer

Κανακίδου, Μαρία
Ντούνας, Κωνσταντίνος

Abstract

In this study the seasonal distribution of heavy metal and other relevant chemical substances from surface sediments collected from Heraklion Bay continental shelf is presented. Results comprise heavy metals concentration measurements from a north-south direction transect of 16 sampling stations located from 10 to 200 meters following the bathymetry of the Bay. Additionally, a comparison of seasonal results between winter – summer sampling periods (December 2014 – June 2015) is also performed. It is well known that surface sediments present the final sink for many anthropogenic pollutants that enter into the environment from various land based resources. Accordingly, the continental shelf of Heraklion Bay is expected to be impacted by chemical pollution derived mainly by Heraklion city with more than 200.000 inhabitants and the surrounding industrial, tourism as well as agricultural activities. The aims of this study were to study the levels, bathymetric distribution and ecological risks of heavy metals in surface sediments from Hearklion Bay and also to compare the current status of pollution in the area with older records based on literature since the beginning of the 90s decade hoping to provide useful information to help with the environmental management and assessment of this bay area. For sampling the research vessel of HCMR “PHILIA” was used. Sediment samples were collected from 16 sampling stations located along a transect having a north – south direction following the bathymetric gradient of the bay. In each station three samples of surface sediments for the analysis of heavy metals were collected by using a benthic quantitative sampler (Smith Mc Intyre crab). In total 96 samples were collected and analysed for their heavy metal content (16 depths * 3 samples X * seasons). Heavy metal sediment concentration measurements were performed by using Inductively Coupled Plasma - Mass Spectrometry; ICP-MS. Results were compared with various worldwide applied sediment quality guidelines with the aim to characterize and discriminate seabed areas as polluted or non polluted. This comparison was performed in two groups of Heraklion Bay continental shelf stations, one at depths between 10 and 40 meters (infralittoral zone) and a second in comprising deeper stations between 50 and 200 meters (circalittoral zone) in order to proceed in a more accurate ecological interpretation of our results.

Language

Greek

Subject

Atomic mass spectrometry

Continental shelf

Heavy metals

Heraklion Gulf

Marine sediments

Ατομική φασματομετρία μάζας

Βαρέα μέταλλα

Ηπειρωτική υφαλοκρηπίδα

Θαλάσσια ιζήματα