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Volume 34 Issue 1
Jan.  2015
Article Contents

Citation:

Effects of short-term weathering on the N-alkanes fraction of crude oils in Bohai Sea

  • Received Date: 2013-12-27
    Accepted Date: 2014-03-18
  • The information on the weathering of spilled oil is necessary to the study of the behavior and fate of the spilled oil, in which the information of the oil fraction content is important especially. In this study, a lab scale experiment was conducted and the effects of short-term weathering on the several crude oils (light, medium and heavy oil) were investigated using GC-MS. The concentrations of n-alkanes at various degrees of weathering were obtained, and the correlation between evaporation percentage and the concentration of n-alkanes was indicated. The effects of weathering on the crude oils and faction contents varied from oil to oil. The BZ28-1 crude oil was seriously weathered with the evaporation percentage of approximately 22% in 24 hours. The next is the CQH crude oil, and the SZ36-1 crude oil is weathered least with the evaporation percentage less than1%. The concentrations of n-alkanes fraction in the crude oils were approximately 70.2810-3, 38.1910-3 and 0.4210-3, respectively. The abundance of n-alkanes gradually decreased with the weathering time extended, and the degrees of concentration reduction were different among different carbon numbers. The concentration changes of the C13~C26 in CQH crude oil and the evaporation percentages were confirmed as the linear correlation, which could be considered as the indicated index of weathering degrees.
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  • [1] 赵云英,杨庆霞.溢油在海洋环境中的风化过程[J].海洋环境科学,1997,16(1):4551.[6]FINGAS M F. Studies on the evaporation of oil spills[R]. Ottawa, Ontario:The Seventeenth Arctic and Marine Oil Spill Program Technical Seminar, Environment Canada,1994:189-212.[10]杨庆霄. 海上石油蒸发过程的研究[J]. 海洋学报(中文版),1990,2(12):187-193.[11]倪张林, 马启敏, 富丽锟,等. 利用GC和GC/MS对溢油风化的鉴定[J].环境化学,2008,2(27):256-259.[12]李 芸, 李思源, 杨万颖,等. 短期风化对溢油组成的影响[J]. 海洋环境科学,2010,4(29):516-520.[13]FINGA S M.The evaporation of oil spills: Development and implementation of new prediction methodology[C]//Proceedings of the 1999 International Oil Spill Conference.Washington:American Petroleum Institute,1999:281-287.[16]包木太, 文 强, 崔文林,等. 六种成品油的正构烷烃色谱指纹提取与鉴别[J]. 西安石油大学学报(自然科学版),2007,1(22):87-90.[17]严志宇,殷佩海.海上溢油蒸发过程的研究进展[J].海洋环境科学,2000,19(2):74-79.[19]DALINGPS, AAMO OM, LEWISA,et al. SINTEF/IKU oil-weathering model: predicting oil properties at sea[C] //Proceedings of the 1997 International Oil Spill Conference.Washington:American Petroleum Institute,1997:297-307.
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Effects of short-term weathering on the N-alkanes fraction of crude oils in Bohai Sea

  • 1. College of Environmental Science & Engineering, Tianjin University, Tianjin 300072, China;
  • 2. China Offshore Environmental Service(Tianjin)Co., Ltd., Tianjin 300457, China;
  • 3. CNOOC Research Institute, Beijing 100027, China

Abstract: The information on the weathering of spilled oil is necessary to the study of the behavior and fate of the spilled oil, in which the information of the oil fraction content is important especially. In this study, a lab scale experiment was conducted and the effects of short-term weathering on the several crude oils (light, medium and heavy oil) were investigated using GC-MS. The concentrations of n-alkanes at various degrees of weathering were obtained, and the correlation between evaporation percentage and the concentration of n-alkanes was indicated. The effects of weathering on the crude oils and faction contents varied from oil to oil. The BZ28-1 crude oil was seriously weathered with the evaporation percentage of approximately 22% in 24 hours. The next is the CQH crude oil, and the SZ36-1 crude oil is weathered least with the evaporation percentage less than1%. The concentrations of n-alkanes fraction in the crude oils were approximately 70.2810-3, 38.1910-3 and 0.4210-3, respectively. The abundance of n-alkanes gradually decreased with the weathering time extended, and the degrees of concentration reduction were different among different carbon numbers. The concentration changes of the C13~C26 in CQH crude oil and the evaporation percentages were confirmed as the linear correlation, which could be considered as the indicated index of weathering degrees.

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