Identification of concentrations and sources of PM2.5-bound PAHs in North China during haze episodes in 2013
Identification of concentrations and sources of PM2.5-bound PAHs in North China during haze episodes in 2013
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2013年华北地区雾霾期间PM2.5结合PAHs浓度及来源识别
DOI：
10.1007/s11869-015-0386-8
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发表时间：
2016-11-01
影响因子：
5.1
通讯作者：
Wang, Wenxing
中科院分区：
文献类型：
--
作者：
Lu, Wei;Yang, Lingxiao;Wang, Wenxing
对2013年6月在山东禹城采集的PM2. 5（粒径小于2. 5 μ m的颗粒物）样品中12种多环芳烃（PAHs）进行了分析，以确定其浓度、组成、来源及其致癌风险。结果表明，灰霾天气期间，大气中PAH的平均浓度较高，（28.28 +/- 8.35纳克米-3），与非烟霞事件相比（23.68 +/- 4.17 ng m（-3）），诊断比和主成分分析表明，多环芳烃的主要来源是化石燃料和燃煤，可能来自汽车排放和工业来源以及生物质燃烧。煤燃烧和生物质燃烧的贡献显着更多的烟霾发作期间，而液体化石燃料燃烧（如石油）是在非烟霾期间的主要贡献者。此外，后向轨迹计算显示，来自工业污染和生物质燃烧地区的空气质量的长距离输送对该地区多环芳烃的浓度有显着贡献。高分子量多环芳烃（HMW-PAHs）的浓度从非雾霾条件下的62.3%增加到雾霾期间的67.9%。灰霾期间苯并[a]芘的致癌当量值（7.09 ng m（-3））高于非灰霾期间（5.64 ng m（-3）），山东省30岁以上的成年人患癌症的风险增加。
An analysis of 12 polycyclic aromatic hydrocarbons (PAHs) in PM2.5 (particulate matter with a diameter smaller than 2.5 microns) samples collected at Yucheng, Shandong, in June 2013 was conducted to determine the concentrations, composition, sources, and associated cancer risk. The results revealed that the average PAH concentration was higher during haze episodes (28.28 +/- 8.35 ng m(-3)) when compared to non-haze episodes (23.68 +/- 4.17 ng m(-3)), and diagnostic ratio and principal component analyses indicate that the predominant sources of PAHs were from fossil fuel and coal combustion, likely from vehicle emissions and industrial sources and biomass burning. Coal combustion and biomass burning contributed significantly more during haze episodes, whereas liquid fossil fuel combustion (e.g. petroleum) was the dominant contributor during the non-haze periods. In addition, back-trajectory calculations revealed that the long-distance transport of air masses from regions with industrial pollution and biomass burning contributed significantly to the concentrations of PAHs in the region. The concentration of high molecular weight PAHs (HMW-PAHs) increased from 62.3 % under non-haze conditions to 67.9 % during the haze periods. The benzo[a]pyrene-equivalent carcinogenic potency value during haze episodes was higher (7.09 ng m(-3)) than that during non-haze (5.64 ng m(-3)) periods and adults over 30 years old in the Shandong province are at an increased risk of cancer from PAHs.