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摘要: |
对2012年郑州市大气中气态和颗粒态多环芳烃(PAH<sub>s</sub>)的分布特征与来源进行了分析。结果表明,ρ(∑PAH<sub>s</sub>) (包括气相与颗粒相)为23.27~194.61 ng/m<sup>3</sup>,气相中∑PAH<sub>s</sub>高于颗粒相,四环以下的PAH<sub>s</sub>大都存在于气态中;在夏、春2季,较小分子质量(≤178)的PAH<sub>s</sub>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(PAH<sub>s</sub>)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PAH<sub>s</sub>可能主要来自煤和液体燃料(汽油柴油)的燃烧。 |
关键词: 环境空气 气态多环芳烃 颗粒态多环芳烃 来源解析 郑州 |
DOI: |
分类号:X513 |
基金项目:2011年河南省科技攻关重点基金资助项目(11210231005) |
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Distribution Characteristics and Source Apportionment of PAHs in Atmosphere and Particulates in Zhengzhou |
ZHANG Dan, NAN Shu qing, WANG Wei si, ZHAO Xin na, DUO Ke xin, ZHANG Jun
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Abstract: |
This work analyzed the distribution characteristics and sources of both gaseous and particulate polycyclic aromatic hydrocarbons (PAH<sub>s</sub>) in urban atmosphere of Zhengzhou City in 2012. The results showed that the total mass concentration of PAH<sub>s</sub> in atmosphere, including gaseous and particulate, was between 40.00 to 194.61 ng/m<sup>3</sup>, and that mass concentration of gaseous PAHs was higher than that of the particulate forms. PAH<sub>s</sub> containing less than four aromatic rings mainly existed in gaseous forms. In spring and summer, a relatively high proportion of PAH<sub>s</sub> were molecules having masses below 178, while in winter, this was the case with PAH<sub>s</sub> having molecular masses above 252. Mass concentration of PAH<sub>s</sub> decreased with the following functional areas: industrial area, traffic compact area, and living area. The major sources of gaseous and particulate PAH<sub>s</sub> in atmosphere were possibly from the burning of coal and liquid fuel (gasoline and diesel oil). |
Key words: Ambient air Gaseous polycyclic aromatic hydrocarbon Particulate polycyclic aromatic hydrocarbon Source apportionment Zhengzhou |