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Benzene and Toluene Levels Measured with DOAS During Vehicular Restrictions in Beijing
Su-wen Li*,Pin-hua Xie,Min-hong Wei,Jiang-tao Wang
Author NameAffiliationE-mail
Su-wen Li* Huaibei Normal University, Huaibei 235000, ChinaKey Laboratory of Environmental Optical & Technology, Chinese Academy of Sciences, Hefei 230031, China swli@chnu.edu.cn 
Pin-hua Xie Key Laboratory of Environmental Optical & Technology, Chinese Academy of Sciences, Hefei 230031, China  
Min-hong Wei Huaibei Normal University, Huaibei 235000, China  
Jiang-tao Wang Huaibei Normal University, Huaibei 235000, China  
Abstract:
Measurements of atmospheric benzene and toluene were carried out continuously using dif-ferential optical absorption spectroscopy from August 7 to August 28 in Beijing during the period of vehicular restrictions. The correlations between traffic flows and totals of benzene and toluene were studied during the period of vehicular traffic restrictions from August 17 to August 20 and non-traffic restrictions on August 16 and August 21. The correlation coef-ficient was 0.8 between benzene and toluene. And the calculated daily mean value ratios of benzene to toluene were 0.43-0.50. During the period of vehicular restrictions, traffic flows were reduced about 11.8% and the levels of benzene and toluene were reduced by 11.4% and 12.8%, respectively. The vehicle emissions were recognized as the major sources for atmospheric benzene and toluene in Beijing.
Key words:  Differential optical absorption spectroscopy, Benzene and toluene, Vehicular restrictions, Traffic emissions, Traffic flows
FundProject:
北京机动车限行期间苯和甲苯的DOAS测量
李素文*,谢品华,韦民红,王江涛
摘要:
基于差分光学吸收光谱(DOAS)技术在北京机动车限行期间8月7日到28日对苯和甲苯进行连续监测,获取苯、甲苯的变化特征,分析交通排放苯、甲苯和车流量关系. 监测结果表明,整个交通管制期间,监测点苯与甲苯相关系数为0.8,且二者比值为0.43~0.50,充分证明苯系物具有同源性. 限车时段苯的浓度下降11.4%,甲苯下降12.8%,而车流量下降11.8%,因此苯和甲苯是北京机动车排放的主要来源.
关键词:  DOAS,苯和甲苯,机动车限行,交通排放,车流量
DOI:10.1063/1674-0068/28/cjcp1409158
分类号: