초기 톨루엔 농도가 톨루엔-NOx-공기 혼합물의광산화 반응에 미치는 영향- II. 입자상 물질의 생성 및 성장

Abstract

An experimental investigation of the gas-phase photooxidation of toluene-NOx-air mixtures at sub-ppmconcentrations has been carried out in a 6.9 m3, indoor smog chamber irradiated by blacklights. Measuredparameters in the toluene-NOx experiments included aerosol, O3, NO, NO2, NOx, CO, SO2, toluene, and airtemperature. The initial toluene concentration ranged from 225ppb to 991ppb and the initial concentration ratio oftoluene/NOx ~ 20. It was found that the variation of aerosol numberconcentration with irradiation time caused by the photooxidation of toluene-NOx-air mixtures depended on theinitial toluene concentration for similar concentration ratio of toluene/NOx. The dependency of initial tolueneconcentration on the photooxidation of toluene-NOx-air mixtures for toluene/NOx=5~ 6 seemed to be opposite tothat for toluene/NOx=10~ 11. The maximum number concentration of aerosols formed by photooxidation and theaerosol yield depended on both initial toluene concentration and initial concentration ratio of toluene/NOx. In thisstudy, the aerosol yield, deed as aerosol formed per unit toluene consumed, was found to be 0.01~ 0.16.