Μελέτη τοξικότητας των ιζημάτων της λίμνης Παμβωτιδας με in vivo τεχνικές (Master thesis)
Sediments of aquatic ecosystems are the deposition place for all polluting agents. The most common environmental pollutants are heavy metals, mainly due to anthropogenic activities. High concentrations of heavy metals are potentially toxic. The concentrations of heavy metals in sediments are 3 – 5 orders of magnitude higher than in the water column. Heavy metals are mainly absorbed on Fe and Mn oxides, on clay minerals and on organic material. In the sediments of Lake Pamvotis, which is enriched with urban, rainwater and agricultural run-offs, have been found high concentrations of heavy metals. Ni, Hg, Cr and Cu concentration exceed the established limits for sediments quality according to “Sediments Quality Guidelines”. The aim of this study was to investigate the potential toxicity of sediments of Lake Pamvotis by using two different experimental models. Thamnotoxkit was used to detect acute toxicity, with no significant results. Allium cepa Test was used to evaluate possible chronic toxicity. Chromosomal aberrations, nuclear abnormalities and occurrence of micronuclei are observed at higher frequencies in the sediment compared to controls. These results provide an important indication that Lake’s Pamvotis sediments are seriously polluted and continuous monitoring is necessary in order to avoid adverse impacts on the ecosystem and the interacting organisms.
|Institution and School/Department of submitter:||Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας|
|Keywords:||Τοξικότητα,Ίζημα,Λίμνη Παμβώτιδα,Βαρέα μέταλλα,Toxicity,Sediments,Lake Pamvotis,Heavy metals|
|Appears in Collections:||Διατριβές Μεταπτυχιακής Έρευνας (Masters)|
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|Μ.Ε. ΚΟΥΜΑΣΗ ΔΗΜΗΤΡΑ 2019.pdf||26.25 MB||Adobe PDF||View/Open|
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