太湖流域地表水中多环芳烃的来源解析及风险评价

Pollution Characteristics, Source Apportionment and Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Water from Taihu Lake Basin

文章利用气相色谱-质谱联用仪(GC-MS)对太湖流域地表水中16种多环芳烃(PAHs)进行了定量检测,分析了地表水中溶解态PAHs的含量分布特征,利用同分异构体比值法和主成分分析法对水体中的PAHs进行了源解析,并对水体中PAHs进行了生态风险评价。结果表明,2015年1月、7月水体中溶解态∑PAHs浓度范围分别为46.5~244 ng/L、19.6~82.7 ng/L,与国内外其它地表水相比,整体的污染水平较低。从16种多环芳烃单体的组成来看,太湖流域溶解态PAHs以2环、3环、4环为主。源解析结果显示,流域地表水中的PAHs主要来源于石油、煤、天然气等燃料的燃烧,部分来源于石油污染。生态风险评价表明,研究区水体中PAHs造成的生态风险较小。

Sixteen polycyclic aromatic hydrocarbons (PAHs)in surface water from Taihu Lake basin were quantitatively ana- lyzed by GC-MS (gas chromatography-mass spectrometry).The distribution was discussed,the source apportionment of PAHs in surface water was conducted by the isomer ratio and principal component analysis,and the risk assessment was stud- ied.The results showed that the total concentrations of dissolved PAHs ranged from 46.5to 244ng/L in January 2015,and from 19.6 to 82.7ng/Lin July 2015,which is lower than the PAHs concentrations.in other surface waters in the world.The dis- solved PAHs were dominated by 2-,3-and 4-ring components in water samples.The results of source apportionment sug- gested that PAHs came mainly from oil,coal,natural gas and other fuels combustion,and partly from oil pollution.The results indicated that ecological risk of PAHs in surface water was in low level.