Occurrence, gas/particle partitioning and carcinogenic risk of polycyclic aromatic hydrocarbons and their oxygen and nitrogen containing derivatives in Xi'an, central China.
Occurrence, gas/particle partitioning and carcinogenic risk of polycyclic aromatic hydrocarbons and their oxygen and nitrogen containing derivatives in Xi'an, central China.
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DOI：
10.1016/j.scitotenv.2014.10.054
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
C. Wei;Yongming Han;B. A. Bandowe;Junji Cao;Rujin Huang;H. Ni;Jie Tian;W. Wilcke
中科院分区：
文献类型：
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作者：
C. Wei;Yongming Han;B. A. Bandowe;Junji Cao;Rujin Huang;H. Ni;Jie Tian;W. Wilcke
对2012年3、9月采集的西安市中心城区空气中29种多环芳烃(PAHs)、15种含氧多环芳烃(OPAHs)、11种硝化多环芳烃(NPAHs)和4种氮杂环芳烃(Azas)以及颗粒物结合碳组分(有机碳、元素碳、焦炭和烟尘)进行了提取和分析。3月份∑、29PAHs、∑、15OPAHs、∑、11NPAHs和∑+4AZAs的平均浓度(气态氮+颗粒物)分别为1267.0±307.5、113.8±46.1、11.8±14.8和26.5±11.8 ng/m−；9月份分别为784.7±165.1、67.2±9.8、9.0±1.5和21.6±5.1 ng/m−。颗粒物中∑-29PAHs、∑-15OPAHs和∑-11NPAHs的浓度与碳组分(OC、EC、焦炭和烟尘)的浓度呈显著正相关。在两个采样期内，PAHs和opahs对颗粒物中有机物的吸附和颗粒表面的吸附都是重要的，9月份吸收更多，而NPAHs的吸收始终是最重要的过程。3月份，PAHs和NPAHs的总致癌风险较高。气态化合物在3月份和9月份分别占总健康风险的29%至44%，而此前的大多数研究都没有考虑到这一点。
29 parent- and alkyl-polycyclic aromatic hydrocarbons (PAHs), 15 oxygenated-PAHs (OPAHs), 11 nitrated-PAHs (NPAHs) and 4 azaarenes (AZAs) in both the gaseous and particulate phases, as well as the particulate-bound carbon fractions (organic carbon, elemental carbon, char, and soot) in ambient air sampled in March and September 2012 from an urban site in Xi'an, central China were extracted and analyzed. The average concentrations (gaseous + particulate) of ∑ 29PAHs, ∑ 15OPAHs, ∑ 11NPAHs and ∑ 4AZAs were 1267.0 ± 307.5, 113.8 ± 46.1, 11.8 ± 4.8 and 26.5 ± 11.8 ng m− 3in March and 784.7 ± 165.1, 67.2 ± 9.8, 9.0 ± 1.5 and 21.6 ± 5.1 ng m− 3in September, respectively. Concentrations of ∑ 29PAHs, ∑ 15OPAHs and ∑ 11NPAHs in particulates were significantly correlated with those of the carbon fractions (OC, EC, char and soot). Both absorption into organic matter in particles and adsorption onto the surface of particles were important for PAHs and OPAHs in both sampling periods, with more absorption occurring in September, while absorption was always the most important process for NPAHs. The total carcinogenic risk of PAHs plus the NPAHs was higher in March. Gaseous compounds, which were not considered in most previous studies, contributed 29 to 44% of the total health risk in March and September, respectively.