Wang Li, Wang Li-jun, Shi Xing-min, Lu Xin-wei
Huan Jing Ke Xue. 2016 Apr 15;37(4):1279-86.
A total of 58 surface dust samples were collected from Xi'an city. The concentrations of 16 priority polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatography with a flame ionization detector (GC-FID). At the same time, the distribution and sources of PAHs in surface dust were studied. The results showed that the concentrations of individual PAH ranged from 14.69 to 6370. 48 microg x kg(-1), and the total concentrations of 16 PAHs (∑16 PAHs) ranged from 5039.67 to 47,738.50 microg x kg(-1), with a mean of 13,845.82 microg x kg(-1). Compared to the Y PAHs levels of other cities, the ∑16 PAHs in surface dust of Xi'an belonged to a relatively higher level. PAHs in surface dust were mainly dominated by high molecular weight PAHs with 4-6 rings and the concentration of 7 carcinogenic PAHs (1 CPAHs) accounted for 46.08% of 3 16PAHs. The mean of ∑16 PAHs in surface dust had the highest concentration at industrial area; followed by the educational area, traffic area, business and traffic area; residential area and parks showed relatively lower concentration. The average content of ∑16 PAHs in surface dust presented an increasing trend along the main urban area--the second ring road--the third ring road. ∑16 PAHs in surface dust had higher concentrations at the industrial areas of the east and west suburbs of Xi'an, the south suburb and the north section of the second ring road; ∑16 PAHs concentrations in the main urban area, north suburb and southeast part of Xi'an were relatively lower. The results of ratio, cluster analysis and principal component analysis showed that PAHs in surface dust were mainly originated from the combustion of fossil fuels and coal combustion. Among them, diesel combustion reached 36.07%, gasoline combustion accounted for 32.31%, and coal combustion was resposbe for 23.40%
共采集了西安市58个地表灰尘样本。采用带有火焰离子化检测器的气相色谱法（GC-FID）分析了16种优先多环芳烃（PAHs）的浓度。同时，研究了地表灰尘中PAHs的分布及来源。结果表明，单个PAH的浓度范围为14.69至6370.48μg·kg⁻¹，16种PAHs（∑16 PAHs）的总浓度范围为5039.67至47738.50μg·kg⁻¹，平均值为13845.82μg·kg⁻¹。与其他城市的PAHs水平相比，西安市地表灰尘中的∑16 PAHs处于相对较高水平。地表灰尘中的PAHs主要以4 - 6环的高分子量PAHs为主，7种致癌PAHs（1 CPAHs）的浓度占∑16 PAHs的46.08%。地表灰尘中∑16 PAHs的平均值在工业区浓度最高；其次是教育区、交通区、商业和交通区；居民区和公园的浓度相对较低。地表灰尘中∑16 PAHs的平均含量沿主城区 - 二环路 - 三环路呈上升趋势。西安市东郊和西郊的工业区、南郊以及二环路北段的地表灰尘中∑16 PAHs浓度较高；西安市主城区、北郊和东南部的∑16 PAHs浓度相对较低。比值、聚类分析和主成分分析结果表明，地表灰尘中的PAHs主要来源于化石燃料燃烧和煤炭燃烧。其中，柴油燃烧占36.07%，汽油燃烧占32.31%，煤炭燃烧占23.40% 。 （注：原文中“resposbe”拼写错误，应为“responsible”）
