...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Uptake of Gas-Phase Nitrous Acid by pH-ControIled Aqueous Solution Studied by a Wetted Wall Flow Tube
【24h】

Uptake of Gas-Phase Nitrous Acid by pH-ControIled Aqueous Solution Studied by a Wetted Wall Flow Tube

机译：湿壁流管研究pH控制的水溶液对气相亚硝酸的吸收

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Uptake kinetics of gas phase nitrous acid (HONO) by a pH-controlled aqueous solution was investigated by using a wetted wall flow tube. The gas phase concentration of HONO after exposure to the aqueous solution was measured selectively by the chemical ionization mass spectrometer in a high sensitive manner. The uptake rate of the gaseous HONO was found to depend on the pH of the solution. For the uptake by neutral and alkaline solutions, the gas phase concentration was observed to decay exponentially, suggesting that the uptake was fully limited by the gas phase diffusion. On the other hand, the uptake by the acidic solution was found to be determined by both the gas phase diffusion and the liquid phase processes such as physical absorption and reversible acid dissociation reaction. The decay was analyzed by the rate equations using the time dependent uptake coefficient involving the saturation of the liquid surface. While the uptake processes by the solution at pH = 2—3 were well described by those calculated using the physical and chemical parameters reported for the bulk, the uptake rates by the solution at 4 < pH < 7 deviate from the calculated ones. The present result can suggest that the pH at the liquid surface is lower than that in the bulk liquid, which is responsible for the additional resistance of mass transfer from the gas to the liquid phase.
机译：通过使用湿式壁流管研究了pH受控的水溶液对气相亚硝酸（HONO）的吸收动力学。通过化学电离质谱仪以高灵敏度的方式选择性地测量了暴露于水溶液后HONO的气相浓度。发现气态HONO的吸收速率取决于溶液的pH。对于中性和碱性溶液的吸收，观察到气相浓度呈指数衰减，这表明吸收受到气相扩散的完全限制。另一方面，发现酸性溶液的吸收是由气相扩散和液相过程如物理吸收和可逆酸解离反应两者决定的。通过速率方程使用涉及液体表面饱和度的随时间变化的吸收系数来分析衰减。虽然使用报告的大部分物理和化学参数计算出的溶液在pH = 2-3时的吸收过程可以很好地描述，但是在4 H <7的情况下，溶液的吸收速率与计算得出的偏差。该结果可以表明，液体表面的pH值低于散装液体中的pH值，这导致了从气相到液相的传质的额外阻力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号