哈尔滨大气中PAHs污染特征

多环芳烃(PAHs)是大气中广泛存在的一种有毒污染物,因其具有"三致"毒性,已成为关注的焦点。本文通过在哈尔滨市区设置大气采样点,利用大流量主动采样器进行为期一年的大气样品采集,对大气中PAHs的浓度、污染特征进行了研究,并深入探讨了PAHs的污染源和贡献率,结果表明,哈尔滨大气中∑16PAHs浓度范围为6.3～340 ng/m3,平均浓度为100±94 ng/m3,主要以低分子量的PAHs为主。与国内外的研究相比,哈尔滨大气中PAHs的污染处于中等污染水平。PAHs具有明显的季节差异,低温气象条件和排放源的增强是导致冬季PAHs污染加重的主要原因。

Pollution Characteristic Of PAHs in Air in Harbin

Polycyclic aromatic hydrocarbons （PAHs） are a group of ubiquitoustoxic substancesin air. Due to their toxicity, such as carcinogenic, mutagenic and immunotoxic properties, PAHs have become a hottopic of increasing concern. The air sam- ples were collected by a high volume active air sampler on a weekly base in the urban region of Harbin for one year. The concen- tration and pollution characteristic of PAHs were studied, and the types and contributions of sources were also deeply investigated. The results indicate that the concentration of ∑16 PAHs ranged from 6. 3 to 340 ng/m3 , and the average concentration was 100 3= 94 ng/m3. The composition of PAHs was predominated by low molecular weight compounds. The atmospheric PAHs concentration in Harbin was comparable with other urban regions. The PAHs exhibited obvious seasonal variation with much higher concentration in heating season than non - heating seasons, and the low temperature of weather and enhanced emission of sources should be the results for the severe PAHs pollution in heating season.