Abstract
The photochemical reactivities of non-methane hydrocarbons (NMHC) in emission sources and environments were studied by ultraviolet irradiation test of NMHC complexes, which had approximately source and environment compositions. Each complexes were composed of 18 kinds of NMHC, which were chosen from the results of environment analysis. As the emission sources, gasoline vapor, oil refinery, petrochemical facility, solvent and automobile were chosen.
For irradiation test, the bellows type smog chambei. of 6.64m3 was used under ultraviolet intensity 7mw/cm2 (k1=0.41 min-1), temperature 30°C, relative humidity 50%, initial concentration HC 10 ppm, NO 1 ppm, irradiation time 5 h. The results were as follows:
The photochemical reactivities of source NMHC showed the highest in petrochemical facility containing a lot of ethylene and the lowest in gasoline vapor being mainly composed by paraffins. The reactivities of source NMHC mixture, which were made in consideration of hydrocarbon emission amounts for each sources, were considerably similar to that of environment NMHC complexes. The reactivities of NMHC in sources and environments tended to increase with the increase of olefin and aromatic contents in relation to O3 dosage, consequently it was considered that olefin and aromatic contents were useful for evaluation of photochemical reactivities of source and environment NMHC.
