Department of Geology and Geoenviromment
Library of the School of Science

2021-06-29

2021

PANAGOU KONSTANTINA

Αργυράκη Αριάδνη, Καθηγήτρια, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ

Περιβαλλοντική Κινητικότητα δυνητικά τοξικών στοιχείων σε εδάφη των μεταλλευτικών περιοχών Στρατωνίου και Ολυμπιάδας, ΒΑ Χαλκιδικής

Greek
English

Environmental mobility of potentially toxic elements in surface soils of Olympias and Stratoni,NE Chalkidiki, Greece

This dissertation was prepared in the framework of Undergraduate Program of the Department of Geology and Geoenvironment of the National and Kapodistrian University of Athens, Laboratory of Economic Geology and Geochemistry. The purpose of the study was to evaluate the environmental mobility of 5 potentially toxic elements, Pb, Cu, Zn, Mn, Ni in surface soils of Olympias and Stratoni, NE Chalkidiki, Greece. In order to estimate the mobility of each element, we carried out 3 extractions. The first extraction was according to a simplified physiologically extraction test (SBET), employing a glycine-doped HCl reagent in order to examine the relative oral bioaccessibility of the elements in human’s organism. The second extraction was done with dilute nitric acid (0.43M HNO3) so as to calculate the chemically reactive elemental fraction in soil. The last extraction was with EDTA (0.05M) to estimate the potential plant availability of the elements. The extractions were applied to 10 soil samples from the wider area. Also 4 samples were scanned by SEM-EDS, to observe metallic host phases. Elemental concentration were measured by AAS and have shown that high concentrations of Pb, reaching about 6000 mg/kg can be explained by the presence of galena. Low concentrations of Ni and Cu have been noticed. However, high geochemical background has been noticed in Zn, because of the existence of sphalerite, and in Mn due to rhodochrosite. Each reagent presents different concentrations in metals, giving different element’s mobility. Some samples present different concentrations in specific element, even if the origin of these samples is from the same area. This phenomenon is reasonable because of the heterogeneity of soil. The high concentrations of some elements are justified because of the mineralization of this area and long duration of exploitation.

Science

Mobility, Bioaccessibility, plant availability, Olympias, Stratoni

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https://pergamos.lib.uoa.gr/uoa/dl/object/2948091