Distributrion and behaviour of organotin compounds in the coastal marine enviroment of the eastern Adriatic

Furdek, Martina (2015) Distributrion and behaviour of organotin compounds in the coastal marine enviroment of the eastern Adriatic. Doctoral thesis, Faculty of Science > Department of Geology.

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Abstract

Trisupstituted organotin compounds, namely tributyltin (TBT) and triphenyltin (TPhT), have been used as biocides in antifouling paints. Since it was established that they are highly toxic to various untargeted aquatic organisms, their usage in antifouling paints is banned in many countries worldwide, as well as in Croatia since 2006. In spite of the fact that Croatian Adriatic coast is an area with highly developed nautical tourism and intensive marine traffic, the level of contamination with organotin compounds was never investigated. In this work a comprehensive investigation of the distribution of organotin compounds (butyltins, phenyltins, methyltins and octyltins) in different marine compartments (seawater, mussels Mytilus galloprovincialis and sediments) along the entire coastal area was performed. The results obtained demonstrated that the majority of the investigated location is significantly polluted with butyltins, with the degree of pollution decreasing from marinas and ports to locations which are less exposed to marine traffic. A detailed research of butyltins and phenyltins behaviour and stability in contaminated sediments was performed. It was demonstrated that the degradation is taking place primarily in the porewater, while the critical step in the whole process is their desorption from sediments. The mechanism and kinetic of butyltins and phenyltins degradation was studied by species-specific isotopically enriched tracers. It was demonstrated that the first dealkylation step is the limiting step in their total degradation, while the degradation of butyltins is faster than the degradation of phenyltins. Furthermore, it was shown that sediments characteristics, mainly organic matter, by controlling the desorption influence the TBT degradation efficiency and consequently define its persistence in the contaminated sediments, which thus increase in sediments rich in organic matter.

Item Type: Thesis (Doctoral thesis)
Keywords: organotin compounds, tributyltin, Adriatic Sea, seawater, mussel Mytilus galloprovincialis, sediments, degradation, organic matter
Supervisor: Nevenka, Mikac
Date: 2015
Number of Pages: 204
Subjects: NATURAL SCIENCES > Geology > Geology and Paleontology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 01 Jul 2015 12:27
Last Modified: 01 Jul 2015 12:27
URI: http://digre.pmf.unizg.hr/id/eprint/4024

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