泛杭州湾海域沉积物中多环芳烃分布及源解析

2011~2014年每年对泛杭州湾海域36个站位采集表层沉积物样品，对沉积物样品中16种多环芳烃（PAHs）的含量进行检测，了解其浓度水平、空间分布特征以及组成结构，并通过结构组成进行来源解析。结果表明，2011~2014年该海域沉积物中PAHs处于中度污染水平，平均含量及其标准偏差分别为（116.03±15.26）×10-9、（106.59±13.90）×10-9、（129.05±14.37）×10-9、（106.10±10.43）×10-9。空间分布上，PAHs高值区主要集中于长江口以及舟山海域附近，近岸区域高于远岸区域，远岸区有个别相对高值区。单体PAH中，菲的含量最高，环数主要分布在3~5环，以高分子量为主；来源解析结果表明污染源主要是煤、木柴和生物质的燃烧，部分站位同时受到石油源影响。

Distribution and sources of polycyclic aromatic hydrocarbons in sediments of Pan Hangzhou bay

Polycyclic aromatic hydrocarbons (PAHs) surface sediment samples were collected from the Pan Hangzhou Bay at 36 sites from 2011 to 2014.The concentration level,spatial distribution,composition structure and possible sources of PAHs were investigated.The results implied that the survey sea area was at a moderate PAHs pollution level with average concentrations of (116.03±15.26) ×10-9,(106.59±13.90)×10-9,(129.05±14.37)×10-9 and (106.10±10.43)×10-9 in sequence by year.The distribution of PAHs level showed a decrease trend from inshore to offshore with high patches mainly located around the Yangtze River Estuary and the Zhoushan Coast.Phenanthrene dominated in concentration out of the 16 priority PAHs and the proportion of 3~5 rings-PAHs was much high.The source analysis implied that PAHs were mainly from the combustion of coal,wood and biomass,with some stations affected by oil leakage.