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SUMMARY:Salt Molality: Impacts on Organic Partitioning in Baltimore’s  At
 mosphere
LOCATION:Virtual Seminar
TZID:America/Denver
DTSTART:20210428T160000
UID:2026-05-19-04-52-56@natsci.colostate.edu
DTSTAMP:20260519T045256
Description:About the Seminar:\n\nInorganic salts can enhance (“salting-i
 n”) or inhibit (“salting-out”) the partitioning of organic gases to 
 aqueous solutions relative to that in pure water.  These phenomena may a
 ffect the composition and abundance of secondary organic aerosol (SOA)\, t
 hough their importance in the atmosphere is largely unconstrained at prese
 nt.  In this work\, we quantify the effects of salt identity\, salt conc
 entration (ionic strength)\, and solution pH on the partitioning of atmosp
 heric water-soluble organic gases (WSOCg) at a site in Baltimore County\, 
 MD.  The experimental pH (pH = 1 – 6) and ionic strengths (10-3 – 1
 01 mol kg-1) span a wide range of conditions found in atmospheric particl
 es\, clouds\, and fog droplets.  Chloride salts (NaCl\, NH4Cl\, and KCl)
  exhibit a strong salting-out effect at all ionic strengths &gt\; 0.005 mo
 l kg-1 and pH = 1.8 – 6.  Conversely\, sulfate salts (NaSO4\, (NH4)2S
 O4\, and K2SO4) induce both salting-in and salting-out behaviors\, dependi
 ng on ionic strength and pH.  These results suggest that monovalent cat
 ions have a minimal effect on the partitioning behavior of ambient organic
  gases\, while both ionic strength and pH exert important influences on t
 he distribution of organics in the atmosphere.\n\nJoin Zoom Meeting\n\nMee
 ting ID: 936 1980 5479\n\nPasscode: 1872 4:00 pm
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