A novel diurnal and seasonal variation analysis of BTEX in Bengaluru urban area  

作　　者：H.N.Sowmya M.Dinamani G.P.Shivashankara H.K.Ramaraju B.S.Surendra Vijaya V.Shanbhag R.Prajwal 

机构地区：[1]Department of Civil Engineering,Dayananda Sagar College of Engineering,Bangalore 560078,India [2]Department of Chemistry,Dayananda Sagar College of Engineering,Bangalore 560078,India [3]Department of Physics,GFGC,Vijayanagar,Bengaluru 560040,India

出　　处：《Research in Cold and Arid Regions》2024年第1期14-19,共6页寒旱区科学（英文版）

摘　　要：In the urban atmosphere of Bengaluru, various volatile organic compounds(VOCs), particularly Benzene,Toluene, Ethylbenzene, and Xylene(BTEX), have shown an increasing trend in concentration. The present research was conducted during summer and monsoon seasons, focusing on Kadubeesanahalli, a high-traffic area within the Bengaluru Metropolitan City. Hourly sample data was collected using a BTEX analyzer(Model GC955-600) and subsequently transformed into daily, monthly, and seasonal values. The study revealed distinct patterns in benzene concentrations. Benzene levels were lowest during the early morning hours, specifically from 1:00 a.m.to 7:00 a.m.. Concentrations then increased from 7:00 a.m. to 9:00 a.m. and again from 4:00 p.m. to 11:00 p.m.,corresponding to the morning and evening peak traffic hours. However, between 10:00 a.m. and 4:00 p.m., the concentration decreased due to reduced traffic levels. These diurnal variations in benzene concentration are influenced by meteorological parameters. Comparing the two seasons, higher concentrations of Benzene, EthylBenzene, and MP-xylene were observed during the summer season. This increase is attributed to the elevated temperatures during summer, which promote the vaporization of BTEX compounds. Conversely, lower BTEX concentrations were recorded during the monsoon season due to the wet deposition process. The observed positive correlation(r > 0.5) among BTEX parameters strongly suggests a common source, most likely originating from vehicular emissions.

关 键 词：BTEX Summer variation Meteorological parameters Correlation 

分 类 号：X51[环境科学与工程—环境工程]