Zhu Jianqiang, Wang Shuyan, Tsona Narcisse T, Jiang Xiaotong, Wang Yifeng, Ge Maofa, Du Lin
Environment Research Institute, Shandong University , Ji'nan 250100, China.
Shenzhen Research Institute, Shandong University , Shenzhen 518057, China.
J Phys Chem A. 2017 Sep 14;121(36):6800-6809. doi: 10.1021/acs.jpca.7b06877. Epub 2017 Sep 6.
Rate constants at room temperature (293 ± 2 K) and atmospheric pressure for the reaction of methyl n-propyl ether (MnPE), CHOCHCHCH, with OH and NO radicals and the Cl atom have been determined in a 100 L FEP-Teflon reaction chamber in conjunction with gas chromatography-flame ionization detector (GC-FID) as the detection technique. The obtained rate constants k (in units of cm molecule s) are (9.91 ± 2.30) × 10, (1.67 ± 0.32) × 10, and (2.52 ± 0.14) × 10 for reactions with OH, NO, and Cl, respectively. The products of these reactions were investigated by gas chromatography-mass spectrometry (GC-MS), and formation mechanisms are proposed for the observed reaction products. Atmospheric lifetimes of the studied ether, calculated from rate constants of the different reactions, reveal that the dominant loss process for MnPE is its reaction with OH, while in coastal areas and in the marine boundary layer, MnPE loss by Cl reaction is also important.
在一个100升的氟化乙丙烯 - 特氟龙反应室中，结合气相色谱 - 火焰离子化检测器（GC - FID）作为检测技术，测定了室温（293±2K）和大气压下正丙基甲基醚（MnPE，CHOCHCHCH）与OH、NO自由基以及Cl原子反应的速率常数。所得到的速率常数k（单位为cm³·分子⁻¹·s⁻¹）分别为：与OH反应的速率常数为(9.91±2.30)×10⁻¹¹，与NO反应的速率常数为(1.67±0.32)×10⁻¹²，与Cl反应的速率常数为(2.52±0.14)×10⁻¹⁰。通过气相色谱 - 质谱联用（GC - MS）研究了这些反应的产物，并对观察到的反应产物提出了形成机制。根据不同反应的速率常数计算得出的所研究醚的大气寿命表明，MnPE的主要损失过程是其与OH的反应，而在沿海地区和海洋边界层中，MnPE与Cl反应导致的损失也很重要。
