| A series of characteristic experiments were conducted in a self-made photochemical smog chamber， which was used to simulate atmospheric photochemical reactions of acetylene and NOx under room temperature of (20±1)℃. The effect of acetylene and NOx on ozone production by photochemical reactions was discussed. The wall decay of O3 and NO2 were determined, which were 5.80×10-6s-1 and 2.41×10-6s-1, respectively. Such decay should be omitted relative to O3 and NO2 in simulative experiments. The effective light intensity for a single black lamp of 40 W was determined to be 0.64×10-3s-1, which was expressed by the photolysis rate of NO2.The effect of different light intensity, initial concentrations of acetylene and NOx on O3 production was discussed after correction of background O3 from purified air. The incremental reactivity (IR) of acetylene were calculated. For four different experiments, the maximum values of IR are 1.76×10-2, 2.68×10-2, 2.04×10-2 and 2.84×10-2, respectively. It is found that there are close relationships between IR and initial acetylene concentrations, and between IR and irradiation intensity, and that there is no significant relation between IR and initial NOx concentrations. |
