Effect of relative humidity on HCl formation from the reaction of H2SO4 and HNO3 with NaCl particles

Adsorption and heterogeneous reactions of ClONO2 and N2O5 on/with NaCl aerosol

“…In the subsequent reaction, the product HNO 3 can react further with NaCl to form gaseous HCl. 37 3.1.2 H 2 O adsorption and reconstruction on the NaCl (100) surface. Water is a ubiquitous atmospheric constituent and plays a key role in many atmospheric heterogeneous chemical reactions.…”

Heterogeneous Reaction of HCOOH on NaCl Particles at Different Relative Humidities

“…Sea salt aerosols (SSAs), the common component in the atmospheric environment, are yielded by wave action on the whole oceans. , The influences of SSAs on global climate include direct effects by scattering light and indirect effects by serving as cloud condensation nuclei (CCN) in the troposphere. , SSAs could also affect ozone chemistry and oxidative capacity by releasing halogen compounds such as HCl, Cl 2 , and ClNO in the atmosphere. − The reaction of SSAs with acidic species can release volatile HCl and produce corresponding salt, which has a well-known mechanism as illustrated by : − ,− where HA represents acidic species such as H 2 SO 4 and HNO 3 . This reaction could induce chloride depletion of NaCl, which is a major component of SSAs. ,,, Sea salt aerosol is a complicated system containing many components such as MgCl 2 , NaCl, sulfate, nitrate, and organics. ,− NaCl, the most abundant component of sea salt, has been extensively used as surrogate for sea salt aerosols in the studies on the interactions with trace gases such as NO 2 , H 2 SO 4 , and HNO 3 . ,,− For example, HNO 3 , a volatile inorganic acid, can displace the chloride of NaCl to generate gaseous HCl under both dry (in the absence of water vapor) and wet conditions (in the presence of water vapor). , The condensed phase H 2 SO 4 could substitute chloride in NaCl. ,, However, the chloride depletion due to the influence of inorganic species cannot fully explain the whole chloride deficit in the atmospheric aerosols. ,, Therefore, there should be other pathways for chloride depletion in the atmosphere. Combining field measurements and laboratory studies, Laskin et al reported the surprising chloride depletion triggered by the reactions of condensed phase organic acids (such as malonic acid, citric acid, and malic acid) with NaCl in mixed droplets upon dehydration .…”

“…This reaction could induce chloride depletion of NaCl, which is a major component of SSAs. 5,13,15,17 Sea salt aerosol is a complicated system containing many components such as MgCl 2 , NaCl, sulfate, nitrate, and organics. 12,18−20 NaCl, the most abundant component of sea salt, has been extensively used as surrogate for sea salt aerosols in the studies on the interactions with trace gases such as NO 2 , H 2 SO 4 , and HNO 3 .…”

“…14,16 The condensed phase H 2 SO 4 could substitute chloride in NaCl. 5,13,15 However, the chloride depletion due to the influence of inorganic species cannot fully explain the whole chloride deficit in the atmospheric aerosols. 6,12,17 Therefore, there should be other pathways for chloride depletion in the atmosphere.…”