Time filter

Source Type

Liu Z.,Shandong Jianzhu University | Li N.,Shandong Jianzhu University | Hou L.,Institute of Research Academy of Environmental science | Lu B.,Institute of Research Academy of Environmental science
Chinese Journal of Environmental Engineering | Year: 2015

Fifty-five kinds of VOCs in the atmosphere were analyzed for the potential reactivity and active components identification, based on two-year air pollution monitor data in Jinan City. The results showed that the atmospheric hydroxyl radical consumption rate (LOH) and ozone formation potential (OFP) of VOCs corresponded with the concentration profiles. The numbers were higher in summer, which was easier to cause the compound atmosphere pollution. The VOCs atmospheric chemical activity had a good linear correlation with the mixing ratio, which mean that the composition of VOCs in the atmosphere was constant. The average·OH radical loss rate constant (KOH )value of VOCs was much higher than that of alkenes while the mixing incremental reactivity(MIR) value was similar to that of ethylene. It means that the chemical reactivity of atmospheric VOCs was stronger. The alkenes volumetric fraction was far less than alkanes while the chemical reactivity contribution rate was high, demonstrating that alkenes were the key active component, including cis-2-butene, propylene, ethylene, butene, trans-2-butene, isoprene, styrene, 2-methyl-1-pentene, cis-dipentene, m/p-xylene, o-xylene, toluene, 1, 2, 4-trimethylbenzene and cyclopentane. Meanwhile, the effect of aromatics and cyclopentane also played an important role. ©, 2015, Science Press. All right reserved. Source

Liu Z.-C.,Shandong Jianzhu University | Zhang F.,Shandong Jianzhu University | Hou L.-J.,Institute of Research Academy of Environmental science | Liu Y.-T.,Institute of Research Academy of Environmental science | Lu B.,Institute of Research Academy of Environmental science
Huanjing Kexue/Environmental Science | Year: 2012

Totally 56 kinds of volatile organic compounds (VOCs) in ambient air of Ji'nan City in summer 2010 were monitored by on-line GC to analyze their pollution characteristics and their relationship with weather conditions. The results showed that the majority of VOCs in ambient air in Ji'nan were alkanes, aromatics and olefins, accounting for 98.2% of the 56 kinds of total volatile organic compounds (TVOCs) detected. The concentrations of VOCs remained stable in June and July, and were significantly higher in mid and late August, and the quality percentages of the VOCs components showed some variations with changes in temperature. In sunny days, the diurnal variation curve of VOCs concentration had a bimodal characteristic, with the two peaks appearing in the rush hours with heavy traffic. There were no obvious bimodal distribution in rainy days and the concentrations were higher. The concentration of VOCs in ambient air in summer showed negative correlation with the wind speed and hours of sunshine, when the atmospheric stability was high, the pollutants were difficult to diffuse, which lead to increasing concentration of VOCs. The main sources of VOCs in Ji'nan are industrial emissions, motor vehicle emissions, the evaporation and leakage of gasoline, etc. Source

Discover hidden collaborations