Journal
MARINE POLLUTION BULLETIN
Volume 62, Issue 11, Pages 2469-2475Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2011.08.021
Keywords
Oil spills; Yellow River Delta; Weathering; Terrestrial environments; Source identification
Funding
- National Natural Science Foundation of China [40806048, 40873049]
- CAS/SAFEA [2011060]
- Chinese Academy Sciences [AJ0809xx-035]
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With its close proximity to Shengli Oilfield, China's second largest oilfield, the Yellow River Delta is at high risk for crude oil contamination. The massive oil discharge in oilfield may offer a chance for a natural experiment to investigate compositional changes of oil residues and study the stability of source- and weathering-dependent molecular parameters in oil residues after spills. The results demonstrate that the conventional diagnostic ratios, such as C(29)20S/(20S + 20R), C-29/C30H, C-30 beta alpha/alpha beta, C(31)22S/(22S + 22R), C-2-DBTs/C-2-PHENs, C-3-DBTs/C-3-PHENs, DET/MCHRY, CHRY/PHENs, are also valid for oil source identification even after extensive weathering of spilled oils in terrestrial environment, although some exceptions were encountered for extensively weathered sample. Moreover, the ratios of selected specific biomarkers (the oleanane index, the gammacerane index) have been developed and assessed as source indicators. Finally, we find that some maturity parameters based on alkyl naphthalenes and methyl phenanthrenes in petroleum geochemistry, such as the methylnaphthalene ratios (TMNr, TeMNr, PMNr), the methylphenanthrene ratios (MPI-1, MPDF), can be applied for the source identification and correlation at their lightly to moderately weathered stage. (C) 2011 Elsevier Ltd. All rights reserved.
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