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SUMMARY:Quantifying the pH of atmospheric aerosol and understanding its dri
 vers
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20230222T160000
UID:2026-04-22-05-31-24@natsci.colostate.edu
DTSTAMP:20260422T053124
Description:About the Seminar\n\nThe acidity of atmospheric particles is im
 portant for the phase partitioning of semi-volatiles\, the solubility of m
 etals\, and the rates of heterogeneous reactions\, but is challenging to m
 easure directly. Even with extremely accurate measurements of the dominant
  contributors to the ion balance in particles\, one can rarely deduce the 
 activity of H+ with sufficient precision to estimate pH. In the seminar\,
  I will share examples from our ambient measurements demonstrating how sim
 ultaneous knowledge of the gas phase ammonia concentration alongside parti
 cle phase composition can provide the necessary constraint to reliably cal
 culate pH values. As the dominant atmospheric base\, ammonia serves as the
  key multiphase buffer through much of the atmosphere. As traditional inor
 ganic acid precursor emissions drop\, we are seeing evidence that organic 
 acids may be increasingly important to the ion balance of aqueous aerosol\
 , with implications for the robustness of traditional sampling strategies.
 \n\nAbout the Speaker\n\nJennifer Murphy is a Professor in the Department 
 of Chemistry at the University of Toronto\, where she held a Canada Resear
 ch Chair in Atmospheric and Environmental Chemistry from 2007 – 2016. Sh
 e received a BSc in Chemistry from McGill University (2000)\, a PhD in Che
 mistry from the University of California at Berkeley (2005)\, and complete
 d a postdoctoral fellowship at the University of East Anglia in 2006. She 
 mentors a team of students and postdocs whose research focuses mainly on u
 nderstanding the sources and sinks of reactive nitrogen in the atmosphere 
 and on biosphere-atmosphere exchange. They deploy instruments at ground si
 tes\, on tall towers\, stratospheric balloons\, aircraft and ships to meas
 ure gases and particles in the atmosphere. Her group also analyzes long-te
 rm monitoring of atmospheric pollutants and weather to understand the ways
  that climate and chemistry influence trends in atmospheric composition. 4
 :00 pm
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