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本文对厦门海域水体及表层沉积物的正构烷烃含量及水体中的石油烃含量进行检测,通过正构烷烃的组成特征和特征比值分析其来源,并对石油烃污染情况进行评价。结果表明,厦门海域水体中石油烃含量符合国家一类海水水质标准,正构烷烃含量与1995年厦门海域的水体正构烷烃含量相比有较明显的升高,石油烃污染有加重的可能性。沉积物正构烷烃含量为1.80~4.27μg/g,对姥鲛烷和植烷比值(Pr/Ph)、长短链比值(L/H)、碳优势指数(CPI)和主峰碳数等特征比值的分析,表明厦门海域沉积物环境为还原性,厦门西海域、同安湾和九龙江口海域正构烷烃组成为双峰型,陆源贡献大于海洋贡献且有受到石油烃污染的可能性;东海域和大嶝海域正构烷烃组成表现为单峰型,主要体现为海洋生物贡献,但是无法排除石油烃污染的可能性。
In this paper, the n-paraffin content of water body and surface sediment in Xiamen sea area and the content of petroleum hydrocarbon in water were measured. The source of n-alkane composition and characteristics were analyzed, and the pollution of petroleum hydrocarbon was evaluated. The results show that the hydrocarbon content of Xiamen waters is in line with the national first-class seawater quality standard. The n-alkanes content is obviously higher than that of the n-alkanes in Xiamen waters in 1995, and the possibility of petroleum hydrocarbon pollution aggravating. The n-alkanes content in sediment ranged from 1.80 to 4.27 μg / g. The ratio of pristane to phytane ratio (Pr / Ph), length / short chain ratio (L / H), carbon predominance index (CPI) , Indicating that the sediment environment in Xiamen sea area is reductive. The n-alkanes composition in the west sea area of Xiamen, Tong’an Bay and Jiulong estuary area is bimodal, and the contribution of terrestrial sources is greater than that of the ocean and may be contaminated by petroleum hydrocarbons. In the East China Sea and The composition of n-alkanes in Daban sea is single peaked, which is mainly contributed by marine organisms, but the possibility of petroleum hydrocarbon pollution can not be ruled out.