1993 Volume 28 Issue 2 Pages 58-71
For evaluation of photochemical reactivities of mixed hydrocarbons in various emission sources, direct method by ultraviolet irradiation test and calculation method by photochemical reactivity index like OH radical reaction rate constant and hydrocarbon components were discussed. As emission sources, paint solvents, autoexhaust gas, gasoline vaper and so on, which had large hydrocarbon emission, were considered with environmental hydrocarbons. It was clarified that there were considerable differences of photochemical reactivities in each emission source, and calculation method by OH radical reaction rate constant was useful for evaluation of photochemical reactivities of mixed hydrocaebons.
The relation between initial (hydrocarbon)/(nitrogen oxides) concentration ratio of irradiation test and photochemical reactivity index like O3max, and recent ambient methan concentration in Japan were also discussed.
