北黄海北部表层沉积物中多环芳烃的分布特征及控制因素分析

为研究北黄海北部沉积物中多环芳烃（PAHs）的分布特征及控制因素，于2016年7月在北黄海北部采集31个表层沉积物，并对沉积物中16种PAHs、总有机碳（TOC）和粒度进行分析测定。研究结果表明:该海区沉积物中多环芳烃的总含量范围在3.54~93.07 ng/g之间，平均含量34.50 ng/g，在辽东半岛东岸多环芳烃的分布呈由近岸向外海逐渐递减的趋势，总体看该区域PAHs的污染处于较低水平。主成分分析表明该海区沉积物中多环芳烃的主要来源是化石燃料燃烧源和石油源。该区域有机碳的分布受鸭绿江物质输入的影响，自东向西含量逐渐递减。粒度则呈现长山列岛以东，颗粒较粗；长山列岛以西，颗粒较细，空间变化相对较小。进一步分析表明，PAHs的分布主要受鸭绿江、辽东沿岸中小河流以及黄河的物质来源的影响；此外，该区水动力条件也是影响多环芳烃分布的重要因素。

Distribution characteristics and controlling factors of PAHs in surface sediments in north of North Yellow sea

In order to investigate the distribution and controlling factors of polycyclic aromatic hydrocarbons (PAHs) in the sediments in the north of North Yellow sea, we collected 31 surface sediments in July 2016 in these areas and analyzed PAHs, total organic carbon and particle size.The results show that the total PAHs concentration of the surface sediments was in the range of 3.54 ng/g to 93.07 ng/g (average value, 34.50 ng/g), indicating a relatively low PAHs pollution level in the study area.The distribution of PAHs decreases gradually from offshore to offshore along eastern coast of the Liaodong Peninsula.According to the principal component analysis, the majority of PAHs in the sediments is from fossil fuel combustion and oil spill.The distribution of organic carbon in this area is affected by the material input of the Yalu River, and its content gradually decreases from east to west.The grain size appears to be large in the east of the Changshan Islands; while in the west of Changshan Islands, the grain size is small, and with relatively few variations.Further analysis shows that the distribution of PAHs in the study area is mainly affected by the material source of the Yalu River, small and medium-sized rivers along the Liaodong Peninsula and the Yellow River.In addition, sedimentary dynamic conditions are also important factors affecting the distribution of PAHs.