We studied HCl uptake by MgCl₂ and sea salt over a relative humidity (RH) range from 0% to 34% at 278–313 K using a differential bead‐filled flow tube coupled to a high‐pressure chemical ionization mass spectrometer. The results showed that dry MgCl₂ and sea salt are essentially inert to gaseous HCl with a probability of less than 10⁻⁶. However, under humid conditions, HCl was found to be efficiently taken up by wet inorganic surfaces. The HCl uptake coefficient for MgCl₂ and sea salt increased squarely with RH, reaching a value of 0.00123 and 0.00171, respectively, at 29% RH and 298 K. Such wetting behavior is even enhanced at elevated temperatures, with the coefficient reaching 0.00208 and 0.00239, respectively, at 313 K. Based on the study of the dependence of γ_HCl on the initial HCl concentration, we estimate γ_HCl as 0.012 at 24% RH at a typical HCl concentration in the troposphere. In addition, the observation of the remarkable enhancement in the OH uptake by the HCl‐treated salts agrees with the results of our previous investigation, which suggested that water absorption on salts enhances γ_OH by lowering the surface pH. The proposed mechanism of HCl uptake by sea salt aerosol has implications for ozone production in the marine boundary layer.

中文翻译：

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潮湿条件下MgCl2和海盐吸收HCl的实验研究

我们使用与高压化学电离质谱仪耦合的微珠填充流量管，研究了在278–313 K的相对湿度（RH）范围从0％到34％的范围内，MgCl ₂和海盐对HCl的吸收。结果表明，干燥的MgCl ₂和海盐对气态HCl基本呈惰性，可能性小于10 ^-6。然而，发现在潮湿条件下，HCl能被湿的无机表面有效吸收。MgCl ₂的HCl吸收系数海盐和海盐随RH呈平方增加，在29％RH和298 K时分别达到0.00123和0.00171的值。这种润湿行为甚至在高温下得到增强，在313 K时系数分别达到0.00208和0.00239。基于γ的依赖性的研究的基础上_的HCl初始盐酸浓度，我们估计γ_的HCl 0.012在24％RH下在对流层中的典型的HCl浓度。另外，在OH摄取盐酸处理的盐显着提高的观察与我们之前的调查，这表明在盐提高γ吸水率的结果一致_OH通过降低表面pH值。拟议的海盐气溶胶吸收HCl的机理对海洋边界层中的臭氧产生具有影响。