多元统计在渤海表层沉积物中PAHs源解析上的应用

Source identification of PAHs in surface sediments from Bohai Sea by multivariate statistics

应用聚类分析、主成分分析、多元线性回归等多元统计方法对渤海表层沉积物中PAHs的来源进行分析。结果表明,来源相近的PAHs具有特征相似的成分谱。低环成分可指示石油源,而高环成分则代表燃煤、燃油等燃烧源。渤海表层沉积物中的PAHs呈现石油源和不完全燃烧源的混合特征,后者的贡献更为显著。就各海区表层沉积物而言,辽东锦州湾近岸的大部分站点以低环PAHs占优势,体现石油污染源的影响;其他海区的多数站点以高环PAHs为主,显示化石燃料的不完全燃烧是其主要来源,其中,辽河(双台子河、辽东湾和秦皇岛近岸的PAHs主要来自汽车尾气或燃油,辽东半岛、渤海湾、莱州湾和外海的PAHs主要源于燃煤。

In this study, principal component analysis, cluster analysis and multiple linear regression were used to identify the possible sources of PAHs in surface sediments from Bohai Sea. The results showed that, PAHs from the same sources had similar compositional spectra. PAH components with 2 -3 tings indicated the petrogenic source, while PAH components with 4 or more rings reflected the pyrogenic sources, such as coal and gasoline burning. In Bohai Sea, the sources of PAHs in surface sediments revealed a mixture of petrogenic inputs and incomplete combustion, and the contribution of the latter was more significant. In the different sea areas, low molecular weight PAHs were dominant at the most sites along Jinzhou Bay inside Liaodong Bay, manifested the influence from petrogenic sources; while at the most sites in the other sea areas, high molecular weight PAHs were prevailing, exhibited the incomphte combustion of fossil fuels as the main source, in which PAHs in the coastal sediments of Liaohe-Shuangtaizi Rivers, Liaodong Bay and Qinhuangdao came generally from vehicle exhausts or petroleum combustion, and PAHs in the coastal sediments of Liaodong Peninsula. Bohai Bay. Laizhon Bay and the outer sea were generated mainly from coal burning.