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The residual oil concentrations in seawater and sediments were investigated along the Taean coast of Korea, following the Hebei Spirit oil spill, which occurred on 7 December 2007. The oil concentration in seawater ranged from 0.059 to for the tidal flat culture grounds and from 0.016 to in the fish cage areas in 2008. These were dominated by the seawater temperature relationship. Polycyclic aromatic hydrocarbons (PAHs) in sediments were also analyzed and the concentrations ranged from 3.4 to 509.7 ng/g dry weight. The average PAH level was higher in seawater from the Sinduri area than the Padori area, while the average PAH level in sediments was higher in Padori. The diagnostic ratio of PAHs was investigated to determine the origins of the PAHs. The PAHs in the Seongam area, which was not affected by the oil spill, are of pyrolytic origin, while the PAHs in Padori and Sinduri were of petrogenic origin. The residual oils in the areas affected by the oil spill tended to decrease over time, except in summer. The oils in pore water remained 6- to 16-fold higher, as compared to the seawater overlying the tidal flat, implying that residual oils will continue to influence the affected region for the foreseeable future.

Variation in the Residual Oils in the Culture Grounds on the Taean Coast, Korea after the Hebei Spirit Oil Spill