Uptake of HCl molecules by aqueous sulfuric acid droplets as a function of acid concentration

Journal Article · Fri Apr 20 04:00:00 EDT 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JD095iD05p05631· OSTI ID:5077982

Watson, L R; Van Doren, J M; Davidovits, P ^[1]; Worsnop, D R; Zahniser, M S; Kolb, C E ^[2]

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1. Boston Coll., Chestnut Hill, MA (United States)
2. Aerodyne Research, Inc., Billerica, MA (United States)

The uptake of Hci molecules by acqueous sulfuric acid droplets was measured at 283 K as a function of acid mole fraction. In the apparatus a controllable stream of monodispersed droplets is produced by a vibrating orifice jet. The droplets enter a flow system containing HCl(g). The droplets are switched on and off while the density of the species is continuously monitored by infrared absorption. From the on-off signal a coefficient for the probability of gas uptake upon collision with the liquid surface is calculated. This coefficient is 0.15 for pure water, remains constant up to 0.1 mole fraction of H{sub 2}SO{sub 4} (40 wt%) and then drops sharply to < 10{sup {minus}2} at 0.2 mole fraction (60 wt%). The results are in accord with calculations based on the decrease in the solubility of HCl with increasing H{sub 2}SO{sub 4} mole fraction. Increasing acidity reduces the dissociation of HCl into H{sup +} and Cl{sup {minus}} in solution. Results indicate that mass accommodation coefficients are large enough so that the HCl content of stratospheric aerosols will be determined entirely by this solubility.

• OSTI ID: 5077982
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:D5; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (1990-)
ABSORPTION SPECTROSCOPY
AEROSOLS
AQUEOUS SOLUTIONS
ATMOSPHERIC CHEMISTRY
BENCH-SCALE EXPERIMENTS
CHEMISTRY
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
DISSOCIATION
DROPLETS
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INFRARED RADIATION
INORGANIC ACIDS
MIXTURES
PARTICLES
PH VALUE
PRECIPITATION SCAVENGING
RADIATIONS
SEPARATION PROCESSES
SOLS
SOLUBILITY
SOLUTIONS
SORPTIVE PROPERTIES
SPECTROSCOPY
STRATOSPHERE
SULFURIC ACID
SURFACE PROPERTIES
WASHOUT