天津郊区土-水界面污染流多环芳烃的污染特征及来源解析

Contamination characteristics and source analyses of PAHs in contaminated flows from soil-water interfaces of Tianjin Suburban Areas,China

2007年4月～2008年10月,在强降雨条件下,定点采集天津市郊土-水界面污染流样品64个,运用高效液相色谱仪对16种多环芳烃(PAHs)进行分析测定.结果显示,研究区土-水界面污染流中16种PAHs含量范围在145.6～7495.1μg·L-1,平均含量1220.5μg·L-1,以3、4和5环PAHs为主,分别占PAHs总量的36.5%、26.3%和27.9%.分别利用主成分分析法、比值法和典型源三角图判别法对研究区土-水界面污染流中PAHs的可能来源进行了解析,结果表明,PAHs主要来自于煤炭、化石燃料以及生物质等的燃烧过程,且研究区各监测样点PAHs不是来自于同一个污染源,而是多种污染源共同复合累加的结果.

Sixty-four samples of contaminated flows from soil-water interfaces were systematically collected from April 2007 to October 2008 in suburban areas of Tianjin after strong rainfall. The concentrations of polycyclic aromatic hydrocarbons （PAHs） in the collected samples were determined by high performance liquid chromatography. The results showed that the total concentrations of PAHs in the collected samples ranged from 145.6 to 7495.1 μg·L^-1,with an average value of 1220.5 μg·L^-1. The dominant compounds were 3-5 ring PAHs,which accounted for 36.5%,26.3% and 27.9% of the total PAHs,respectively. The possible sources of PAHs in contaminated flows from soil-water interfaces of the studied areas were examined by principal component analysis,the ratio method and triangle drawing discriminance based on typical sources. The results further indicated that PAHs were mainly derived from the combustion of coals,fossil fuels and biomass. Moreover,PAHs in various monitoring sites of the studied areas were not produced from a single source but are a result of a combination and accumulation of multiple pollution sources.