大辽河水系表层水中多环芳烃的污染特征

采用GC/MS对大辽河水系的浑河、太子河和大辽河表层水和悬浮物中的多环芳烃 (PAHs) 进行了定量分析,探讨了大辽河水系表层水和悬浮物中多环芳烃分布特征与来源.结果表明，水样和悬浮颗粒物中PAHs总量浓度分布范围分别为：水样946.1～13 448.5 ng·L^-1；悬浮颗粒物317.5～238 518.7 ng·g^-1.多环芳烃的浓度分布表现为太子河>大辽河>浑河,靠近工业区的PAHs浓度明显高于城市和非工业区.水样中PAHs以3～5环为主,悬浮颗粒物样中PAHs以2环为主.PAHs特定分子比率分析表明，大辽河水系受到石油输入和热解的复合PAH污染,采样站位附近石油化工和钢铁工业是PAHs的主要来源.与世界其他河流和海洋地区相比,水和悬浮颗粒物中污染浓度较高，具有一定的生态风险.

Contamination characters of polycyclic aromatic hydrocarbons in Daliao River system of China.

With GC/MS, a quantitative study was made on the polycyclic aromatic hydrocarbons (PAHs) in the surface water and suspended particulates in Daliao River system, with their spatial distribution and sources investigated. The results showed that the total PAHs concentration ranged from 946.1 to 13 448.5 ng x L(-1) in surface water, and from 317.5 to 238 518.7 ng x g in suspended particulates. The PAHs concentration was decreased in the order of Taizi River > Daliao River > Hunhe River. The PAHs in surface water were dominated by 3-5 rings, while those in suspended particulates were dominated by 2 rings. The calculated ratios of selected PAHs suggested that the discharges from municipal, petrochemical and steel industrial wastewater, and the atmospheric fallout might be the important PAHs sources, and the contamination sources of PAHs were the mixture of petrogenic and pyrolytic inputs. In comparing with other river and marine systems in the world, Daliao River system had higher concentrations of PAHs in its surface water and suspended particulates, and thus, presented certain ecological risk.