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| Characteristics of VOCs in Beijing urban area during APEC period and its verification for VOCs emission inventory |
| YANG Gan1, WEI Wei1,2, LV Zhao-feng1, CHENG Shui-yuan1,2, LI Yue1 |
1. Department of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China |
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Abstract The ambient VOCs were monitored in the eastern urban area of Beijing city from October 16th to November 27th, 2014. They were analyzed by an off-line analysis method of SUMMA tank sampling and GC-MS. The VOCs results during APEC showed that the 24h daily average concentrations of TVOCs were 49.12×10-9, 25.17×10-9 and 23.38×10-9 respectively during Oct 16~30 (before APEC), Nov 5~11 (APEC) and Nov 12~27 (after APEC), presenting a falling trend with time; however, the daytime average concentrations (8:00~18:00) were 41.43×10-9, 17.36×10-9 and 20.08×10-9 respectively, the lowest daytime concentrations happened during APEC. Meanwhile, the VOCs chemical profiles also showed obvious differences between APEC and before/after APEC, volume mixing ratio of alkenes increasing and those of alkanes and aromatics decreasing. Then the relationship between VOCs and meteorological factors was concluded, based on the VOCs data before and after APEC, the most important impact being from temperature (r = 0.74), followed by the relative humidity (r = 0.67) and no significant correlation with wind speed. Finally, the reduction emissions of the 15main compounds were calculated by using Beijing VOCs emission inventory and VOCs chemical profiles of various sources. A great well correlation between their emission abatement and their daytime average concentration change during APEC were found, with the correlation coefficient of 0.76~0.80, which verified the accuracy of Beijing VOCs emission inventory.
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Received: 10 October 2015
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