渤海湾中部表层沉积物中多环芳烃分布及其来源
DISTRIBUTION AND SOURCE IDENTIFICATION OF POLYCYCLIC AROMATIC HYDROCARBON OF SURFACE SEDIMENTS FROM THE CENTER PART OF BOHAI SEA, CHINA
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摘要: 通过对渤海湾中部海域19个站位表层沉积物样品中检测出的13种优控多环芳烃(EPAs)进行同分异构体、甲基菲、GC—MS定量等分析,探讨了研究区沉积物中多环芳烃分布特征、输入来源和污染水平,结果表明,研究区表层沉积物中多环芳烃总含量为2.1~374.8 ng/g,平均值为33.1 ng/g,多环芳烃总含量呈现出由近岸区向深海区递减的趋势,除最高值BG-60站位外,研究区与其他地区相比污染水平为中—低;化合物组成上以3~4环为主,5~6环次之,从多环芳烃组成以及异构体和甲基菲比值分析表明,研究区沉积物中PAHs以燃烧来源为主,石油类产品和石油化工燃料燃烧贡献最大,煤、木材燃烧贡献次之;高含量的菲和4个高成熟度异常点证实石油烃PAHs污染客观存在。Abstract: 13 surface sediment samples were collected from the center part of Bohai Sea for isomers analysis, methyl phenanthrene and quantitative analysis of GC-MS. Discussed are the characteristics of distribution and the input source and pollution levels in polycyclic aromatic hydrocarbons from the study area sediments. The concentrations of anthropogenic PAHs (ΣEPAPAHs) are 2.1 to 374.8ng/g, on an average of 33.1 ng/g, the concentrations showing a decreasing trend from the coastal area to deep sea, suggesting medium-low level pollution of the study area except for the high content of ΣEPAPAHs in the sediment samples from BG60. The 3 to 4 ring PAHs dominate the 5 to 6 ring PAHs. The anthropogenic PAHs are mainly derived from combustion, petroleum products and petrochemical rather than coal and wood combustion.The high content of phenanthrene and the four high maturity abnormal points indicale the existense of petroleum hydrocarbons PAHs pollution.
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