中文摘要：

分析了外秦淮河丰水期表层底泥中Pb,Cu,Zn及PAHs的含量分布.结果表明：草场门河段底泥中Pb,Cu,Zn和PAHs的含量都达到了最大值,污染最为严重.Pb和Cu显著相关,具有相似的化学行为.三汊河口至集庆门河段的PAHs主要来自石油类和化石燃料的不完全燃烧（低温、中温）或天然成岩过程,而凤台桥至秦虹大桥河段PAHs主要来源于化石燃料的高温燃烧与裂解.外秦淮河表层底泥中Pb与二环和五环PAHs的相关性显著,易发生交互作用.

英文摘要：

This paper described the distribution of lead, copper, zinc and PAHs in the surface sediments of Wai Qinhuai river. The results showed the contents of Pb, Cu, Zn and PAHs in the surface sediments have reached the maximum at Caochangmen. The fact that Pb and Cu have a great correlation indicated they have similar chemical behaviours in the environment. The dominated source of PAHs in the surface sediments from Sanchahekou to Jiqingmen was the incomplete combustion of fossil fuel or natural diagenetic process. And PAHs in the surface sediments from Fengtai bridge to Qinhong bridge were mainly from combustion of fossil fuel in high-temperature. Pb was significantly correlated with two rings PAHs and five rings PAHs, so it was a great possibility to have an interaction between them.