中文摘要：

系统探讨了新乡市道路灰尘中PAHs的含量、分布,并解析了道路灰尘中PAHs的来源,并对新乡市道路灰尘中PAHs进行了生态风险评价,结果表明,新乡市道路灰尘中美国EPA优先监测的16种PAHs的检出率为100%,16种PAHs总量在42.1—8720 ng.g-1之间,平均含量为3223 ng.g-1.与国内外其它城市相比,新乡市道路灰尘中PAHs含量较低,与新乡市的经济发达状况呈现正相关.新乡市道路灰尘中PAHs的组成以4环PAHs为主,占PAHs总量的40.18%.通过多特征比值,对新乡市道路灰尘中PAHs来源进行定性判断,表明其主要来源于石油及其精炼产品的不完全燃烧和木柴、煤的燃烧;进一步通过因子分析/多元线性回归分析表明,新乡市道路灰尘中PAHs主要来源于汽油车、煤和木柴的燃烧以及柴油车的排放,其平均贡献率分别为33.5%、50.6%和15.9%.各种PAHs组分的单因子指数评价结果表明,新乡市道路灰尘已经受到PAHs的较严重的污染.所有样品的综合污染指数表明,新乡市道路中PAHs的综合污染指数的范围在0.09—9.95,平均值为3.38,充分表明新乡市道路灰尘已经受到严重的PAHs污染,具有较高的生态风险.

英文摘要：

This study identified concentrations, distributions, sources and ecological risks of polycyclic aromatic hydrocarbons （PAHs） in road dust from different areas of Xinxiang. Total concentrations of 16 US EPA priority PAHs ranged from 42. 1--8720 ng· g-1 with an average level of 3223 ng· g-1 in road dust from Xinxiang. Compared with those from other cities in the world, road dusts from Xinxiang had a little lower PAHs pollution, which was positively correlated with economic development level of Xinxiang. Composition analysis showed that 4-ring PAH, accounting for 40.18% of total PAHs, was the predominant species in road dust from Xinxiang. Diagnostic ratios indicated that PAHs in road dusts from Xinxiang were primarily generated by incomplete combustion. Further principal component analysis/multivariate linear regression suggested that the main pollution sources identified in road dust from Xinxiang were coal and biomass combustion emission （50.6%）, traffic gasoline （33.5%） and diesel emissions （15.9%）. Ecological risks of PAHs in road dust with single index indicated that there was some heavily polluted by PAHs in Xinxiang city. The N.L. Nemerow composite index of PAHs in road dust ranged from 0.09 to 9.95 with a mean value of 3.38, suggesting that road dusts in Xinxiang have been polluted by PAHs, with high ecological risk.