Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS, 45071 Orléans Cedex 2, France.
Chemosphere. 2010 Apr;79(4):387-93. doi: 10.1016/j.chemosphere.2010.02.009. Epub 2010 Feb 25.
The kinetics of the heterogeneous reactions of O(3) with 17 polycyclic aromatic hydrocarbons (PAHs) present on laboratory generated kerosene soot surface was studied at T=255-330 K in a low pressure flow reactor combined with an electron-impact mass spectrometer. The kinetics of soot-bound PAHs consumption in reaction with O(3) was monitored using off-line HPLC measurements of their concentrations in soot samples as a function of time of exposure to O(3). Concentration of ozone in the gas phase was analyzed by mass spectrometry. The first-order rate constants measured for individual PAHs ranged from 0.004 to 0.008 s(-1) and were found to be independent of the ozone concentration ([O(3)]=(0.5-92) x 10(12) mol cm (-3)) and temperature (255-330 K). Results show that reaction with ozone can be an important degradation pathway of the particulate PAHs in the atmosphere.
在低压流动反应器中，使用电子冲击质谱仪，研究了在 T=255-330 K 下，实验室生成的煤油烟尘表面上 O(3)与 17 种多环芳烃（PAHs）的非均相反应动力学。通过离线 HPLC 测量烟尘样品中 PAHs 的浓度随暴露于 O(3)时间的变化，监测了与 O(3)反应时烟尘结合的 PAHs 的消耗动力学。通过质谱分析气相中的臭氧浓度。测量的单个 PAHs 的一级速率常数范围为 0.004 到 0.008 s(-1)，并且发现它们与臭氧浓度([O(3)]=(0.5-92) x 10(12) mol cm (-3))和温度(255-330 K)无关。结果表明，与臭氧的反应可能是大气中颗粒态 PAHs 的重要降解途径。
