Split oil identified and vertical migration in sediment of seabed: Case in Dalian Bay

doi:10.3969/j.issn.1001-909X.2018.01.006

Abstract

Abstract: Two core sediment samples collected in the area of 16^th July 2010 split oil accident by box crab during April 2013. The biological dispersant were used during the split treatment in heavy pollution area. Site BQ050 and Site BQ007 located in the area where biological dispersant and chemical dispersant were used, respectively. The TOC content, soluble organic content (asphalt A), δ¹³C_org value and ²¹⁰Pb_exof sediments were analyzed for identifying the contaminated organic matters. The sediments of Site BQ050 have higher organic matter content (TOC: 0.58%~1.51%, mean: 1.15%; asphalt A: 0.061 5%~0.566 4%, mean: 0.174 9%, up to 0.566 4% in depth 10~12 cm), heavier δ¹³C_org value(-22.2‰~-20.5‰PDB, mean: -21.74‰PDB), and higher asphalt A/TOC ratio (7.0%~34.8%, mean: 14.13%) indicating that the organic matter characterized by exotic. Meanwhile, the δ¹³C_org values of sediments are similar, which shows the same organic input in the depth from 2 cm to 16 cm. The ²¹⁰Pb_ex of sediments has the similar distribution to the asphalt A. The sediments of Site BQ007 have much lower asphalt A content and asphalt A/TOC ratio compared to the sediments of Site BQ050, and the ²¹⁰Pb_exdistribution is normal. The content of ²¹⁰Pb_ex decreasing with depth shows the logarithmic correlation. The exotic organic matter is low in the Site BQ007. The split oil(characterized by asphalt A)has been migrated to about depth of 16 cm in the Site BQ050 until April 2013.

Key words: split oil accident, sediment, asphalt A, δ¹³C_org value, ²¹⁰Pb_ex

CLC Number:

YU Xiao-guo, YANG Hai-li, LIU Xing, LEI Ji-jiang, LIN Zhong-sheng, YAO Zi-wei, ZHANG Wei-yan, YAO Xu-ying, JIN Xiao-bing. Split oil identified and vertical migration in sediment of seabed: Case in Dalian Bay[J]. Journal of Marine Sciences, 2018, 36(1): 58-65.

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