Abstract：The ambient concentration of benzene, toluene, ethylbenzene and xylenes (BTEX) were measured continuously in the urban area of Tianjin from 5th June to 31th July, 2012 by online GC-FID instrument. The ozone formation potential of each component was calculated by the maximum incremental reactivity (MIR) factor. The results showed that the averaged concentration of BTEX was 38.72μg/m3 during the observation period. Concentration of the toluene and xylene were the highest among all components. Ethylbenzene, benzene and o-xylene came next. There was obviously diurnal variations of BTEX concentration. The BTEX concentration which affected by both atmospheric photochemistry reaction and boundary layer diffusion ability was lowest during afternoon and maintained a high level at night. Each species had a consistent daily variation tendency. The high mass concentration ratio of benzene to toluene (0.77) implied that motor vehicle emissions were the main source of BTEX. The factors of oil and chemical coating volatile had also influence. Maximum incremental reactivity (MIR) was used to calculate the largest ozone formation potentials of benzene, toluene, ethyl benzene and xylene. The m/p-xylene had the largest ozone formation potentials. The ethyl benzene and o-xylene were at same level. The benzene had lowest potential. This result showed that the m/p-xylene had the strongest photochemical reaction activity among all components of BTEX.
姚青, 韩素芹, 蔡子颖, 王佳. 2012年夏季天津城区BTEX污染特征与臭氧潜势分析[J]. 中国环境科学, 2013, 33(5): 793-798.
YAO Qing, HAN Su-Qin, CAI Zi-Ying, WANG Jia. The diurnal variation and ozone production potential of BTEX in Tianjin in the summer of 2012. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(5): 793-798.
