摘要
长江口宝山一个典型孔沉积物中多环芳烃 (PAHs)研究表明 :PAHs总量分布在 (0 .0 8～ 11.74)× 10 -6。总的和单个PAHs化合物随深度发生明显的变化 ,主要特征为亚表层含量最大 ,然后向表层以及随深度的增加而趋于降低。依据荧蒽 /(荧蒽 +芘 )值以及 2～ 3环与 3～ 4环PAH化合物分布特点 ,显示出热解成因 (主要为大气沉降 )可能是孔沉积物 ,尤其是亚表面中PAHs的主要来源。但从甲基萘与萘的比率所显示的PAHs分布样式来看 ,孔剖面附近的污水排放也将可能是重要的石油成因的PAHs来源。文中提出 ,两种输入的叠加混合 ,是产生上述分布特征的主要原因。另外 ,河口及近岸沉积物及其水系统的物化条件、沉积速率。
The results shown that total PAHs concentration ranged from 0.08～11.74×10 -6 in Baoshan core sediments in Changjiang Estuary. Total and individual PAHs dramatically varied with depth. They were characterized by subsurface maximum, followed by decreased levels towards to surface and with depth. Pyrolysis (mainly atmospheric deposition) may be dominant sources in the core profile, especially in subsurface sediments depend on the distributions of Fl/(Fl+Py) of 2～3 ringed and 4～5 ringed congeners. Petroleum derived contamination however may be significant source according to the distribution pattern of alkylated naphthalene to parent naphthalene in the core profile. The primary reason for this is the result of the incorporation of the above two sources. Furthermore, physical and chemical conditions of water sediment system and sedimentation rate and exchange as well as bioturbation also affect the destribution level of PAHs in the core profile.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2000年第4期9-12,17,共5页
Marine Environmental Science
基金
国家自然科学基金资助项目!(4 977110 1
4980 0 18)
英国文化委员会基金资助项目!(SHA/ 0 992 /SAL)
教育部骨干教师计划资助项目
关键词
多环芳烃
沉积物剖面
含量分布
长江口
污染物
polycyclic aromatic hydrocarbon
core sediments
distribution
sources
the Changjiang Estuary
