Huang Li-hua, Mo Chuang-rong, Xu Yong-fu, Jia Long
School of the Environment, Guangxi University, Nanning 530004, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2551-7.
Atmospheric photochemical reactions of propane and NO, were simulated with a self-made smog chamber. The effects of relative humidity (RH) and [C3H8]0/[NOx]0 ratio on ozone formation were studied. The results showed that both the maximum ozone concentration and the maximum value of incremental reactivity (IRmax) of propane decreased linearly with increasing RH. Under lower RH conditions, the occurrence time of peak ozone concentration was about 22 h after the beginning of reaction, and IRmax varied from 0.0231 to 0.0391, while under higher RH conditions the occurrence time of peak ozone concentration was 16 h, and IRmax ranged from 0.0172 to 0.0320. During the 20 h of reaction, within the first 12 h RH did not significantly affect the yield of acetone, whereas after 12 h the lower RH condition could lead to relatively greater amount of acetone. During the first 4-20 h of experiments, acetone concentrations ranged from 153 x 10(-9) to 364 x 10(-9) at 17% RH and from 167 x 10(-9) to 302 x 10(-9) at 62% RH, respectively. Maximum ozone concentrations decreased with increasing [C3H8]0/[NOx]0 ratio and a better negative linear relationship between them was obtained under the lower RH conditions. The smog chamber data and the results from simulation of the C3H8-NOx reactions using the sub-mechanism of MCM were compared, and a significant deviation was found between these two results.
利用自制的烟雾箱模拟了丙烷与一氧化氮的大气光化学反应。研究了相对湿度（RH）和[C3H8]0/[NOx]0 比值对臭氧生成的影响。结果表明，丙烷的最大臭氧浓度和最大增量反应活性（IRmax）均随相对湿度的增加而呈线性下降。在较低相对湿度条件下，臭氧浓度峰值出现时间约为反应开始后22小时，IRmax在0.0231至0.0391之间变化；而在较高相对湿度条件下，臭氧浓度峰值出现时间为16小时，IRmax在0.0172至0.0320之间。在20小时的反应过程中，前12小时相对湿度对丙酮产率影响不显著，而12小时后较低的相对湿度条件会导致丙酮生成量相对较多。在实验的前4至20小时内，相对湿度为17%时丙酮浓度范围为153×10(-9)至364×10(-9)，相对湿度为62%时丙酮浓度范围为167×10(-9)至302×10(-9)。最大臭氧浓度随[C3H8]0/[NOx]0 比值的增加而降低，且在较低相对湿度条件下二者呈现出较好的负线性关系。将烟雾箱数据与使用MCM子机理模拟C3H8 - NOx反应的结果进行了比较，发现这两个结果之间存在显著偏差。
