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| Characteristics of atmospheric PM2.5 and the variation of PAHs in PM2.5 during spring in Hongshan district, Wuhan |
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Abstract 33 atmospheric PM2.5 samples were collected in Hongshan district, Wuhan in the spring of 2014. The PAHs in these samples were analyzed by gas chromatography-mass spectrometry (GC-MS) for investigating the composition and variation of PAHs in PM2.5. The results showed that the PM2.5 concentrations were in the range of 47.99~195.87μg/m3 with the concentration of 101.34±32.49μg/m3, and the exceeding criteria rate was 81.82%. Furthermore, the concentration of PM2.5 did not correlate significantly with meteorological parameters. The total concentration of PAHs in PM2.5 ranged from 8.44 to 34.45ng/m3, and the average was 21.48±7.03ng/m3. The 4 rings PAHs had the highest concentration 11.72ng/m3, which accounted for 54.56% of the total PAHs concentration. According to the diagnostic ratios of PAHs apportioning from typical sources and principle components analysis, vehicle emissions, combustion and coal burning were the dominant sources of PAHs. The total TEQ concentration ranged from 1.10~5.46ng/m3, and the average was 2.99ng/m3, and the exceeding criteria rate was 60.61%.
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Received: 20 December 2014
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