Lei Peiyu, Zhang Feng, Zheng Jingli, Zhang Tongjun, Chang Feng, Meng Zhaowei
Shaanxi Provincial Centre for Disease Control and Prevention, Xi'an 710054, China.
Xi'an Center for Disease Control and Prevention, Xi'an 710054, China.
Wei Sheng Yan Jiu. 2020 Sep;49(5):769-774. doi: 10.19813/j.cnki.weishengyanjiu.2020.05.013.
To analyze the pollution characteristics of polycyclic aromatic hydrocarbons(PAHs) in atmospheric PM_(2. 5) in Lianhu district and Yanta district of Xi'an City.
From 2016-2018, PM_(2. 5) samples were regularly collected at monitoring points in two districts of Xi'an City, and analyzed the content of naphthalene, acenaphthylene, fluorene, acenaphthene, phenanthrene, anthracene, fluoranthene, pyrene, chrysene, benz(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, dibenz(a, h)anthracene, benzo(g, h, i)perylene, indeno(1, 2, 3-cd)pyrene in the samples according to Ambient air and stationary source emissions-Determination of gas and particle-phase polycyclic aromatic hydrocarbons-High performance liquid chromatography(HJ 647-2013). The test result were analyzed and evaluated according to different years, regions and seasons.
The median total PAHs mass concentrations(ΣPAHs) in Lianhu district and Yanta district were 11. 68 and 12. 53 ng/m3, respectively, with no significant difference(P>0. 05). The ΣPAHs of the two districts were decreasing year by year(P<0. 05). The median ΣPAHs in Lianhu district and Yanta district were highest in winter(55. 50, 55. 61 ng/m3) and lowest in summer(4. 62, 4. 57 ng/m3). The top three single indicators of the median PAHs in Lianhu district were benz(b)fluoranthene(1. 90 ng/m3), benzo(g, h, i)perylene(1. 67 ng/m3) and chrysene(1. 34 ng/m3), In Yanta district, they were benz(b)fluoranthene(1. 95 ng/m3), benzo(g, h, i)perylene(1. 63 ng/m3) and pyrene(1. 47 ng/m3). The average mass concentrations of benzo(a)pyrene in Lianhu district and Yanta district were 1. 33 ng/m3 and 1. 10 ng/m~3, respectively. Among all the samples, the qualified samples of benzo(a)pyrene accounted for 72. 75% of the total samples, and the Lianhu district and Yanta district were 71. 20% and 74. 30%, respectively(P>0. 05).
The degree of atmospheric PAHs pollution in Xi'an had decreased year by year, and PAHs pollution in winter was more serious.
分析西安市莲湖区和雁塔区大气PM₂.₅中多环芳烃（PAHs）的污染特征。
2016 - 2018年，在西安市两个区的监测点定期采集PM₂.₅样品，依据《环境空气和固定污染源废气 气相和颗粒物中多环芳烃的测定 高效液相色谱法》（HJ 647 - 2013）分析样品中萘、苊烯、芴、苊、菲、蒽、荧蒽、芘、 Chrysene、苯并(a)蒽、苯并(b)荧蒽、苯并(k)荧蒽、苯并(a)芘、二苯并(a,h)蒽、苯并(g,h,i)苝、茚并(1,2,3 - cd)芘的含量。根据不同年份、区域和季节对测试结果进行分析和评价。
莲湖区和雁塔区PAHs总质量浓度（ΣPAHs）中位数分别为11.68和12.53 ng/m³，差异无统计学意义（P＞0.05）。两个区的ΣPAHs逐年下降（P＜0.05）。莲湖区和雁塔区ΣPAHs中位数冬季最高（55.50、55.61 ng/m³），夏季最低（4.62、4.57 ng/m³）。莲湖区PAHs中位数前三位的单项指标为苯并(b)荧蒽（1.90 ng/m³）、苯并(g,h,i)苝（1.67 ng/m³）和 Chrysene（1.34 ng/m³），雁塔区为苯并(b)荧蒽（1.95 ng/m³）、苯并(g,h,i)苝（1.63 ng/m³）和芘（1.47 ng/m³）。莲湖区和雁塔区苯并(a)芘的平均质量浓度分别为1.33 ng/m³和1.10 ng/m³。所有样品中，苯并(a)芘合格样品占总样品的72.75%，莲湖区和雁塔区分别为71.20%和74.30%（P＞0.05）。
西安市大气PAHs污染程度逐年下降，冬季PAHs污染更严重。
