Abstract
Carbon isotopic compositions of atmospheric Non-methane Hydrocarbons (NMHCs) in the urban areas of Taiyuan and Lanzhou in summer were reported and the sources of NMHCs are discussed. Carbon isotopic ratios (δ13C) of vehicle exhaust, coal-combustion exhaust, fuel volatiles and cooking exhaust were also measured with thermal desorption-gas chromatography-isotope ratio-mass spectrometry (TD-GC-IR-MS). δ13C values of NMHCs in the urban areas of Lanzhou and Taiyuan range from −32.3% to −22.3% and from −32.8% to −18.1‰ δ13C values of vehicle exhaust, coal-combustion exhaust, fuel volatiles and cooking exhaust are −32.6-−21.7%, −24.5%-−22.3%, −32.5%-−27.4% and −31.6%- −24.5%, respectively. The data indicate that vehicle exhaust and cooking exhaust make a significant contribution to the atmospheric NMHCs. Therefore, to reduce emissions of vehicle exhaust and cooking exhaust is critical for controlling atmospheric NMHCs pollution in summer.
Published Version
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