胶州湾表层沉积物中多环芳烃的分布及来源

Distribution and sources of polycyclic aromatic hydrocarbon in sediments of Jiaozhou Bay

利用气相色谱-质谱方法对胶州湾沉积物中23种多环芳烃(PAHs)进行了分析测定。结果表明,PAHs的总含量范围为82～4567ng/g。PAHs总量在表层沉积物中总趋势是东部高于西部,以东岸附近处最大,远离东岸浓度降低,在胶州湾入海口处最低。造成这种格局的原因有:(1)绝大部分污染源集中在胶州湾东岸;(2)胶州湾的环流系统使东部的污染物很难向西部扩散;(3)沉积物粒度及有机质含量对PAHs含量分布有一定的影响。P/A、PL/PY比值、PAHs环数以及烷基化PAHs表明胶州湾表层沉积物中PAHs几乎全部由人类活动产生,来源为煤炭、木材燃烧、石油类高温裂解及油类污染。与国内外同类研究结果相比,判定为中等污染水平。

The compounds of Twenty-three polycyclic aromatic hydrocarbons (PAHs) were measured and identified by GC-MS in the (surface) sediments at 12 stations in Jiaozhou Bay.The spatial variability of the (anthropogenic) pollutants and their (sources) was (studied). The total concentrations of PAHs rane from 82 ng/g to 4567 ng/g, the enriched area is mainly off the eastern coast and (gradually) (reduced) towards west and the entrance of the bay. The distribution pattern can be attributed to (1) the pollution sources are located (mostly) in the eastern coast area and (2) the circulating current pattern in the Jiaozhou Bay hinders (diffusion) of PAHs (from) east (towards) west. P/A, FL/Py ratios and ring numbers of PAHs were used to assess the origins of the (pollutants), suggesting possible sources such as combustion of coal, wood and petrogenic sources.