摘要
利用自制光化学烟雾箱进行了一系列表征实验并模拟了乙炔和氮氧化物NOx在室温(20±1)℃下的大气光化学反应.讨论了乙炔与NOx的协同作用对光化学反应产生O3的影响.实验得到了O3和NO2的壁损失分别为5.80×10-6s-1和2.41×10-6s-1,相对于模拟实验中的O3和NO2,该损失可以忽略.测得了单支40W黑光灯的有效光强为0.64×10-3s-1(以NO2的光解速率表示).经过净化空气的本底校正后,讨论了不同乙炔浓度、NOx浓度以及光照强度对体系产生O3的影响,计算了乙炔的增强反应活性值(incremental reactivity,IR),4组实验的IR最大值分别为1.76×10-2、2.68×10-2、2.04×10-2和2.84×10-2.并发现IR值与乙炔的初始浓度以及光照强度关系密切,与NOx初始浓度关系不大.
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^-3 s^-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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第3期482-488,共7页
Environmental Science
基金
中国科学院知识创新工程项目(KJCX2-SW-H8)
关键词
烟雾箱
乙炔
光化学反应
光化学烟雾
smog chamber
acetylene
photochemical reaction
photochemical smog
