Anthropogenic and natural hydrocarbons in sediments of the Visovac lake

Ujčić, Petar (2015) Anthropogenic and natural hydrocarbons in sediments of the Visovac lake. Diploma thesis, Faculty of Science > Department of Geology.

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Abstract

In this study, a comprehensive characterisation of natural (n-alkanes) and anthropogenic (polycylic aromatic hydrobarbons and linear alkyl benzenes) hydrocarbons in dated sediments of the Visovac Lake was performed. All analyses were carried out using a highly specific method, based on capillary gas chromatography coupled to mass spectrometry (GC/MS). The composition of hydrocarbons in analysed sediment cores indicated that the concentrations of hydrocarbons having natural origin, with long-chain n-alkanes being the dominant group, were higher than the concentrations of individual anthropogenic hydrocarbons. The main input pattern of the natural and anthropogenic hydrocarbons in the Visovac Lake were riverine inputs by the rivers Krka and Čikola. Characteristic diagnostic hydrocarbon ratios revealed that petroleum hydrocarbons and biomass and fossil fuel combustion were the main source of anthropogenic hydrocarbons. Althogh analyses of organic contaminants showed that the anthropogenic impact on the Visovac Lake ecosystem is relatively low, increase of hydrocarbon concentrations in the most recent sediment layers suggests that anthropogenic pressures increased in recent years, probably due the growing traffic, tourism and economic activites in the wider area of Krka National park.

Item Type: Thesis (Diploma thesis)
Keywords: alkanes, polycylic aromatic hydrocarbons, linear alkyl benzens, sediment, gas chromatography, mass spectrometry, lake Visovac
Supervisor: Ahel, Marijan
Date: 2015
Number of Pages: 80
Subjects: NATURAL SCIENCES > Geology > Mineralogy and Petrology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 29 Sep 2015 09:41
Last Modified: 29 Sep 2015 09:41
URI: http://digre.pmf.unizg.hr/id/eprint/4238

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