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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Uptake and Reaction of ClONO_2 on NaCl and Synthetic Sea Salt
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Uptake and Reaction of ClONO_2 on NaCl and Synthetic Sea Salt

机译：ClONO_2在NaCl和合成海盐上的吸收和反应

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摘要

The uptake and reaction of chlorine nitrate (CIONO_2) on NaCI and synthetic sea salt (555) powders was studied at 298 K using a Knudsen cell interfaced to a quadrupole mass spectrometer. A time-dependent uptake coefficient was observed, with a large initial uptake coefficient measured for most samples of yinit > 0.1, followed by a smaller and slowly declining uptake coefficient at longer reaction times. This behavior is shown to be consistent with uptake into, and reaction in, water on the salt surface. The steady-state uptake coefficient on NaCI was invariant over a range of CIONO_2 concentrations from 10~(12) to 10~(13) molecules cm-3 but was dependent on the number of salt particle layers in a manner consistent with approximately two layers of particles being available for reaction. The results of experiments using monolayers and sub-monolayers of salts, where the available reactive surface is known, give an uptake coefficient at longer times after the rapid initial uptake for CIONO_2 on NaCI of yt = (6.5 +- 3.0) * 10~(-3) (2a). The larger uptake coefficient obtained initially compared to longer reaction times helps to reconcile different valuef:. reported earlier by other research groups for this reaction. The uptake coefficient on 555, which holds more water, is much larger than that for NaCI, with yinit = (0.42_(-0.42)~(+0.46)) and yt = (0.16_(-0.16)~(+0.20)) (2#sigma#). At the higher uptake coefficients measured for 5SS, this reaction could be a significant source of Cl_2 in the marine boundary layer if chlorine nitrate is available at a constant concentration of approx 5 ppt.
机译：使用与四极杆质谱仪连接的Knudsen电池，在298 K下研究了氯化钠（CIONO_2）在NaCl和合成海盐（555）粉末上的吸收和反应。观察到随时间变化的吸收系数，对于大多数yinit> 0.1的样品，其初始吸收系数较大，随后在较长的反应时间中，吸收系数较小且缓慢下降。事实表明，这种行为与盐表面水的吸收和反应一致。 NaCl的稳态吸收系数在10〜（12）至10〜（13）个分子cm-3的CIONO_2浓度范围内是不变的，但以与大约两层一致的方式取决于盐颗粒层的数量可用于反应的颗粒数量。使用已知的可用反应性表面的盐的单层和亚单层盐进行的实验结果在yt =（6.5 +-3.0）* 10〜（ -3）（2a）。与更长的反应时间相比，最初获得的更大的吸收系数有助于调和不同的值f ：。其他研究小组早些时候对此反应进行了报道。含有更多水的555的吸收系数比NaCl大得多，yinit =（0.42 _（-0.42）〜（+0.46）），yt =（0.16 _（-0.16）〜（+0.20） ）（2＃sigma＃）。如果对5SS测得的吸收系数较高，那么如果硝酸氯的恒定浓度约为5 ppt，则该反应可能是海洋边界层中Cl_2的重要来源。

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