Electrospray mass spectrometric detection of products and short-lived intermediates in aqueous aerosol microdroplets exposed to a reactive gas
Electrospray mass spectrometric detection of products and short-lived intermediates in aqueous aerosol microdroplets exposed to a reactive gas
复制标题
DOI：
10.1021/jp075505r
复制
发表时间：
2007-12-20
影响因子：
2.9
通讯作者：
Colussi, A. J.
中科院分区：
文献类型：
--
作者：
Enami, S.;Vecitis, C. D.;Colussi, A. J.
通过在线电喷雾质谱法在大约 1 ms 内检测到穿过稀 O3 气体羽流的水性 (Nal/Na-2)S2O3) 微滴中生成的中间体 ISO3- IS2O3- (m/z = 207) 和 (m/z = 239)，并通过碰撞诱导解离来测量它们的稳定性。作为实验条件函数的阴离子反应物和 S2O62-、HSO4-、103 和 13 产物的同时检测提供了真正的界面反应动力学的证据。尽管 O-3(aq) 在本体溶液中与 I- 的反应速度比与 S2O32- 的反应速度快约 3 倍，但在 [I-]/[S2O32-] = 10 个微滴的界面层中，只有 S2O32- 显着耗尽，低于 103(g)]，类似于 50 ppm。
The intermediates ISO3- IS2O3- (m/z = 207) and (m/z = 239) generated in aqueous (Nal/Na-2)S2O3) microdroplets traversing dilute 03 gas plumes are detected via online electrospray mass spectrometry within similar to 1 ms, and their stabilities gauged by collisionally induced dissociation. The simultaneous detection of anionic reactants and the S2O62-, HSO4-, 103, and 13 products as a function of experimental conditions provides evidence of genuinely interfacial reaction kinetics. Although O-3(aq) reacts about 3 times faster with I- than with S2O32- in bulk solution, only S2O32- is significantly depleted in the interfacial layers of [I-]/[S2O32-] = 10 microdroplets below 103(g)] similar to 50 ppm.