福州市区街道灰尘中多环芳烃的质量分数及其来源

采用超高效液相色谱系统(UPLC)荧光检测器法，测定了福州市区14条主要街道灰尘样品中属美国环境保护署(US EPA)优控的15种多环芳烃(PAHs)的质量分数，对其毒性进行了评估，并通过聚类分析、因子分析/多元线性回归等方法，分析了灰尘中PAHs的来源. 结果表明:福州市区的w(PAHs)为1 029.5～5 182.0 μg/kg，平均值为2 884.7 μg/kg，在国内外城市中处于中等含量水平. 14个街道灰尘样品中有5个样品的w(PAHs)超过毒性效应区间低值(ERL)，具有潜在的生态风险. 聚类分析发现，4号，5号，7号和12号采样点分别具有高比例的w(菲),w(苯并［b］荧蒽),w(荧蒽)和w(萘)的特殊来源.对样品中PAHs的来源解析显示，燃烧源占78%，石油泄漏源占22%. 

Concentrations and Sources of PAHs in the Street Dust of Fuzhou City

The concentrations of 15 kinds of polycyclic aromatic hydrocarbons (PAHs),which are on the list of US EPA priority,in 14 main street dust samples in Fuzhou City were analyzed by UPLC with fluorescence detector.The toxicity of the PAHs in street dust was also evaluated.Meanwhile,the cluster method,factor analysis and multiple linear regression method were used to analyze the sources of PAHs.The results showed that the total concentrations of PAHs ranged countries.Among the 14 street dust samples,the total PAHs concentrations of five samples exceeded the effects range-low (ERL) and had potential ecological risks.The cluster method analysis showed there were high proportions of phenanthene,benzo(b)fluoranthene,fluoranthene and naphthelene in sampling sites 4,5,7 and 12,respectively.The major contributions of PAHs in the street dust samples were quantified as 78% from combustion and 22% from oil spills.