龙岩市省控断面水体中多环芳烃的污染特征、风险评价

POLLUTION CHARACTERISTICS,RISK ASSESSMENT OF POLYCYCLIC AROMATIC HYDROCARBONS(PAHS)IN WATER OF THE PROVINCIAL CONTROL SECTION RIVER,LONGYAN

对九龙江流域龙岩市省控断面2011年秋季、2012年冬季以及2012年春季河水中多环芳烃（PAHs）进行了分析.结果表明：该控断面河水中PAHs总量浓度变化为9.9～178.8 ng/L,其组成特征是以3环（56.7％）、5环（24.6％）和4环（15.1％）为主,表明3环、4环及5环PAHs是九龙江流域龙岩市省控断面水中PAHs的最主要成分.地表水健康风险评价结果显示,红坊赤坑、雁石桥、捷步桥、顶坊4个采样点苯并[a]芘（BaP）毒性当量值（EBaP）均超出我国环境保护部（CEPA）制定的EBaP=2.8 ng/L的国家标准.

The distribution of polycyclic aromatic hydrocarbons （PAHs） was studied by determining the levels of 16 PAHs in water samples of the Jiulong River,a very important drinking water source for Fujian and Longyan,China.Samples of surface water were collected from the Jiulong River in November 2011,January 2012,and March 2012,and polycyclic aromatic hydrocarbons （PAHs） were analyzed with constant-energy synchronous fluorimetric method in the present study.The results showed that the total concentrations of PAHs in water ranged from 9.9 to 178.8 ng/L.The PAHs were dominated by 3-ring （56.7%）,5-ring （24.6%） and 4-ring （15.1%） components in water samples.The 3-ring,4-ring and 5-ring PAHs were the most common components in the provincial control section of the Jiulong River.The toxic quivalency factors （TEFs） were used to calculate benzo[a]pyrene equivalents （EBaP） for water samples.The values in four sampling point of benzene[a] pyrene （BaP） toxicity equivalent value （EBaP） were beyond the Chinese Environmental Protection Agency （CEPA） guidelines for drinking water （2.8 ng/ L）.Overall,the surface water resources showed some carcinogenic potential.The result of ecological risk assessment indicated that high potential ecological risk of PAHs was not found in water of the provincial control section of the Jiulong River,Longyan.