多环芳烃在渤海海峡柱状沉积物中的分布

在渤海海峡(S44和T4站位)柱状沉积物中运用气相色谱法定量地检出13种多环芳烃化合物,并对其含量分布及来源进行了分析.多环芳烃浓度总和为60.3ng/g～2076.5ng/g,尚不属严重污染状况,但是苯并芘等强致癌性化合物均有不同程度检出.利用多环芳烃的一些参数(菲/蒽、荧蒽/芘、2～3环化合物总量和4环以上化合物总量等比值及不同分子量的相对浓度)估测了该区的多环芳烃的来源,S44站位的多环芳烃主要来源于化石燃料的不完全燃烧过程;而在T4显示的是石油源和不完全燃烧源的混合特征,这应与研究海区的石油开发或航运等事件有关.同时研究表明多环芳烃在柱样中的分布可提示人文活动强度的影响.

Distribution of Polycyclic Aromatic Hydrocarbon in Core Sediments of the Bohai Straight

Thirteen compounds of PAHs were identified by GC in the core sediments of Bohai Straight (S44 and T4 Stations). The distribution and source identification were studied with the two core sediments. The total concentrations changed from 60.3ng/g to 2076.5ng/g. Though the contamination of PAHs in the study area is quite modest, some carcinogenic compounds were detected in most samples. From the indicators such as Pen/Anth and Fluo/Pyr etc. the dominated origin of PAHs in S44 Station is pyrolytic origins. However, in T4 Station, a mixture of pyrolysis and petroleum origin is suggested in this area. The distribution of PAHs in the core sediments also could be a good indicative of the contribution of human activity.