Mesocosm Study on Weathering Characteristics of Iranian Heavy Crude Oil with and without Dispersants

Title
Mesocosm Study on Weathering Characteristics of Iranian Heavy Crude Oil with and without Dispersants
Author(s)
주창규; 심원준; 임운혁; 하성용; 김문구; 안준건; 김은식; 김영옥; 김기범
KIOST Author(s)
Shim, Won Joon(심원준)Yim, Un Hyuk(임운혁)Ha, Sung Yong(하성용)Kim, Moon Koo(김문구)An, Joon Geon(안준건)Kim, Young Ok(김영옥)
Alternative Author(s)
심원준; 임운혁; 하성용; 김문구; 안준건; 김은식; 김영옥
Publication Year
2012-11-12
Abstract
The environmental fate of Iranian Heavy [ME1] crude oil (IHC) with and without an added oil spill dispersant (OSD) has been studied using a 1,000 kL capacity in situ mesocosm. Physical weathering and chemical composition changes of the oil were monitored for 77 days. The OSD significantly changed the chemical fingerprint of the oil. Compound-specific effects of the OSD could be observed as changes over time in the content of the TPH, unresolved complex mixture (UCM), alkanes, PAHs, hopanes and steranes in the oil. When oil weathers, most hydrocarbons show a rapidly decreasing phase followed by a slowdown and stabilization. Recalcitrant biomarkers,however, show an opposite trend. An additional ca. 10% increase in hydrocarbon formation in the form of UCM occurred after OSD treatment. This change, in effect, increased the half-life of the TPH in the oil with the dispersant (OD), while the enhanced solubility of the low molecular weight PAHs by the OSD decreased the half-life of the alkylated PAHs in the OD. After 77 days of exposure at the sea surface, both the oils with and without the OSD exhibited moderate weathering. Most of the source diagnostic indices maintained their source information, and the weathering indices indicated that evaporation, dissolution, and dispersion were the major weathering processes. The mass balance of the weathered oil was calculated using laboratory and mesocosmoil were monitored for 77 days. The OSD significantly changed the chemical fingerprint of the oil. Compound-specific effects of the OSD could be observed as changes over time in the content of the TPH, unresolved complex mixture (UCM), alkanes, PAHs, hopanes and steranes in the oil. When oil weathers, most hydrocarbons show a rapidly decreasing phase followed by a slowdown and stabilization. Recalcitrant biomarkers, however, show an opposite trend. An additional ca. 10% increase in hydrocarbon formation in the form of UCM occurred after OSD treatment. This change, in effect, i
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/27372
Bibliographic Citation
SETAC North America 33rd Annual Meeting, pp.218, 2012
Publisher
Society of Environmental Toxicology and Chemistry
Type
Conference
Language
English
Publisher
Society of Environmental Toxicology and Chemistry
Related Researcher
Research Interests

Microplastic pollution,Persistent Organic Pollutants,Oil Pollution,미세플라스틱 오염,잔류성 유기오염물질,유류오염

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