上海高校玻璃表面多环芳烃浓度特征及源解析

为了解上海市高校玻璃表面多环芳烃(PAHs)富集水平和来源,对中心城区和郊区的7所高校和1座大学城进行了不同季节玻璃表面有机膜样品采集.利用气相色谱—质谱联用仪(GC-MS)对美国环保署优先控制的16种PAHs进行了测定,对PAHs质量浓度的季节分布、组分特征和污染源等进行了分析.结果表明,中心城区高校玻璃表面PAHs年平均面积归一化质量浓度(541.5ng/m²)明显高于郊区(290.0ng/m²),其中TJU(同济大学)年均质量浓度最高(998.1ng/m²),而SJUT(松江大学城)年均质量浓度最低(226.6ng/m²);SHU(上海大学)玻璃表面PAHs质量浓度季节变化幅度最小,说明污染物来源比较稳定;夏季,秋季和冬季玻璃表面更易富集低环PAHs;单体Phe是各季节占比最高的污染物;多种溯源指标表明上海市高校玻璃表面PAHs以本地源为主,主要来源于油类燃烧和扬尘,特别是汽车尾气的贡献很大;BaP、DahA和Bb+k]F是玻璃表面PAHs主要的致癌物.

Concentration characteristics and source analysis of PAHs on the glass surface of universities in Shanghai

Organic film on the glass surface were gathered from seven universities and a university town in the downtown and suburbs of Shanghai in different seasons to determine the enrichment level and sources of PAHs on the glass surface. Gas chromatography-mass spectrometry (GC-MS) was used to measure the mass concentrations of 16 different types of PAHs that are under the priority control of the United States Environmental Protection Agency. The seasonal distribution of mass concentration, component features, and pollution sources of PAHs on the glass surface was also examined. According to the findings, the annual average area normalized mass concentration of PAHs on the glass surfaces of universities in the downtown (541.5ng/m²) was significantly higher than that in the suburbs (290.0ng/m²), with TJU(Tongji University) having the highest annual average mass concentration (998.1ng/m²) and SJUT (Songjiang University Town) having the lowest annual average mass concentration (226.6ng/m²). The seasonal variation range of PAHs mass concentration on the glass surface of SHU (Shanghai University) was the smallest, implying that the pollution source was fairly unchanged; low-ring PAHs were more easily enhanced on the glass surface in summer, autumn, and winter; Phe was the pollutant with the highest proportion in each season; a wide range of traceability indicators demonstrate that the PAHs on the glass surface of Shanghai universities were mainly local sources and largely from oil combustion and raise dust, particularly from the automotive exhaust; the primary carcinogens of PAHs on glass surfaces were BaP, DahA, and Bb+k]F.