PAH contaminations and recoveries in the sandy versus muddy sediment coastlines after the Hebei Spirit oil spill

Title
PAH contaminations and recoveries in the sandy versus muddy sediment coastlines after the Hebei Spirit oil spill
Author(s)
김문구; Soon Zhi; 안준건; 하성용; 정지현; 임운혁
KIOST Author(s)
Kim, Moonkoo(김문구)Soon, Zhi Yang(Soon, Zhi Yang)An, Joon Geon(안준건)Ha, Sung Yong(하성용)Jung, Jee Hyun(정지현)Yim, Un Hyuk(임운혁)
Publication Year
2017-11-13
Abstract
After the collision between the oil tanker Hebei Spirit and a barge carrying a crane, approximately 10,900 tons of Middle East crude oil was released 10 km off the west coast of Korea in December 2007. Total 438 sediment samples were collected to assess the spatiotemporal trends of PAH contaminations and its recoveries, from December of 2007 through May of 2016. PAH concentrations in sediments measured immediately after the spill ranged from 3.2 ng g-1 to 71,200 ng g-1, with an average of 3,800 ng g-1. Increases in PAH concentrations were observed at stations 7 through 23, which were heavily oiled due to tidal currents and northwesterly wind that transported the spilled oil to these locations. Mean and maximum PAH concentrations decreased drastically from 3,800 to 88.5 ng g-1 and 71,200 to 1,700 ng g-1, respectively, four months after the spill. PAH concentrations highly fluctuated for the first one year after the spill and then decreased slowly to background levels. Reduction rate of PAH concentration was much faster at the sandy beaches (half-life = 43.3 d) than in the muddy sites (half-life = 693 d). In muddy sediments, low attenuation due to low flushing rate in the mostly anaerobic sediment possibly contributed the persistence of PAHs. By May of 2016 (~8.5 yrs after the spill), mean and maximum PAH concentrations decreased by ~ 50 and 500 times, respectively, compared to the initial contamination levels. Composited to assess the spatiotemporal trends of PAH contaminations and its recoveries, from December of 2007 through May of 2016. PAH concentrations in sediments measured immediately after the spill ranged from 3.2 ng g-1 to 71,200 ng g-1, with an average of 3,800 ng g-1. Increases in PAH concentrations were observed at stations 7 through 23, which were heavily oiled due to tidal currents and northwesterly wind that transported the spilled oil to these locations. Mean and maximum PAH concentrations decreased drastically from 3,800 to 88.5 ng g-1 and 71,200 to 1,700 ng g-1, respectively, four months after the spill. PAH concentrations highly fluctuated for the first one year after the spill and then decreased slowly to background levels. Reduction rate of PAH concentration was much faster at the sandy beaches (half-life = 43.3 d) than in the muddy sites (half-life = 693 d). In muddy sediments, low attenuation due to low flushing rate in the mostly anaerobic sediment possibly contributed the persistence of PAHs. By May of 2016 (~8.5 yrs after the spill), mean and maximum PAH concentrations decreased by ~ 50 and 500 times, respectively, compared to the initial contamination levels. Composi
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23578
Bibliographic Citation
SETAC North America 38th Annual Meeting, pp.249, 2017
Publisher
Society of Environmental Toxicology and Chemistry
Type
Conference
Language
English
Publisher
Society of Environmental Toxicology and Chemistry
Related Researcher
Research Interests

Oil Spill Environmental Forensics,Persistent Organic Pollutants,Marine Aerosol,유류오염 환경법과학,지속성유기오염물질,해양 에어로졸

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