郑州大气及颗粒物中多环芳烃的分布特征与来源解析

对2012年郑州市大气中气态和颗粒态多环芳烃(PAHs)的分布特征与来源进行了分析。结果表明,ρ(∑PAHs)(包括气相与颗粒相)为23.27~194.61 ng/m3,气相中∑PAHs高于颗粒相,四环以下的PAHs大都存在于气态中;在夏、春2季,较小分子质量(≤178)的PAHs占比较高,冬季,较大分子质量(≥252)的PAHs占比明显较高;各功能区ρ(PAHs)排序为工业区交通密集区医疗、文化、行政混合区。郑州大气和颗粒物中PAHs可能主要来自煤和液体燃料(汽油柴油)的燃烧。

Distribution Characteristics and Source Apportionment of PAHs in Atmosphere and Particulates in Zhengzhou

This work analyzed the distribution characteristics and sources of both gaseous and particulate polycyclic aromatic hydro-carbons (PAHs) in urban atmosphere of Zhengzhou City in 2012. The results showed that the total mass concentration of PAHs in atmosphere, including gaseous and particulate, was between 40. 00 to 194. 61 ng/m3 , and that mass concentration of gaseous PAHs was higher than that of the particulate forms. PAHs containing less than four aromatic rings mainly existed in gaseous forms. In spring and summer, a relatively high proportion of PAHs were molecules having masses below 178, while in winter, this was the case with PAHs having molecular masses above 252. Mass concentration of PAHs decreased with the following functional areas:in-dustrial area, traffic compact area, and living area. The major sources of gaseous and particulate PAHs in atmosphere were possibly from the burning of coal and liquid fuel ( gasoline and diesel oil) .