Composition Characteristics of Typical VOCs Sources in the Highland City of Lhasa

被引：0
|
作者：
Guo S.-Z. [1 ,2 ]
Ye C.-X. [2 ]
Lin W.-L. [1 ]
Chen Y. [1 ]
Zeng L.-M. [2 ]
Yin Q.-Q. [2 ]
Liu X.-L. [1 ]
机构：
[1] Key Laboratory of Ecology and Environment in Minority Areas, Minzu University of China）, National Ethnic Affairs Commission, Beijing
[2] College of Environmental Science and Engineering, Peking University, Beijing
来源：
Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 04期
关键词：
component spectrum; emission characteristics; hydroxyl radical loss rate（L[!sub]·OH[!/sub]）; ozone formation potential（OFP）; source profiles; volatile organic compounds（VOCs）;
D O I：
10.13227/j.hjkx.202305048
中图分类号：
学科分类号：
摘要：
The low air pressure and oxygen content at high altitudes affect combustion and solvent volatilization processes，which in turn affect the emission characteristics of volatile organic compounds（VOCs）. However，there is very limited knowledge about the VOCs emission characteristics of combustion sources or volatile sources over 3000 m above sea level （asl）. Lhasa City has been undergoing rapid economic development and urbanization，where VOCs emission sources are becoming increasingly complex as a result of energy consumption changing from biomass burning to fuel combustion. Samples from major VOCs emission sources in Lhasa City，including motor vehicle exhaust，gasoline volatilization，diesel volatilization，liquefied petroleum gas（LPG），and incense burning emissions，were collected for analysis to study their compositional spectra and compare them with those in the plains. The VOCs emission profile of LPG was found to be consistent with those in previous studies in the plain area，with dominant propane and butane；gasoline evaporation had the highest proportion of 1，2，4-trimethylbenzene，whereas gasoline vehicle emissions had high proportions of isopentane，n-butane，and propane and a low proportion of 1，2，4-trimethylbenzene，unlike what has been reported in the plain area. Diesel volatilization had a higher proportion of C7 and higher carbon compounds than gasoline volatilization and gasoline vehicle emissions. Diesel vehicle emissions had the highest ratio of oxygenated VOC（OVOC），which was different from the high compositions of propylene and alkanes above C7 in the plains. Incense burning had the highest percentage of OVOC emissions，with acetonitrile as the tracer that distinguished it from other emission sources；it also had a small amount of isoprene emissions，which should not be overlooked. As for the ratio of toluene to benzene（T/B）in gasoline and diesel vehicle exhaust，they were generally consistent with that in the plain area. However，both T/B ratios in diesel evaporation and incense burning were >1，which differed from that in the plain area. In the ternary diagram of benzene，toluene，and ethylbenzene ratios，diesel volatilization fell within the industrial and solvent emission zones，which differed from that in the plain area. Like other cities，alkenes and aromatics were also highly reactive VOCs species in highland cities，contributing significantly to ozone and secondary organic aerosol generation，respectively. Preliminary results indicated that the composition characteristics of VOCs sources in highland areas differed from those in the plains，and further in-depth studies are needed to address their potential environmental and health risks. © 2024 Science Press. All rights reserved.
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页码：2011 / 2018
页数：7
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