Particle Loss Characterization #10 - 2013-03-24



Scanning Mobility Particle Sizer Particle Loss (#355)

Seinfeld chambers

Temperature (°C):

Relative humidity (%):

Particle composition:

  • Ammonium sulfate

Particle measurement size range:

Particle generation method:
Atomized from dilute solution of ammonium sulfate through a Nafion drier and Polonium 210 neutralizer

Date of characterization experiment:

Months since calibration:

Wall loss experiment description:
Particles were introduced into the chamber at the desired concentration and left to decay at the studied environmental condition for several hours.

Wall loss rates calculation method:
The first-order rate coefficient (s-1) was calculated at each size bin by plotting the number concentration vs time trace of that size bin. Then the diameter vs. loss rate relationship was obtained and reported.

Frequency of particle loss experiments:
As needed

Wall loss correction description:
For a typical experiment, the time profile at each size bin is corrected for the loss rate at that size bin. There is an assumption that organic-coated aerosol behaves like ammonium sulfate. Generally, this correction technique is able to remove the loss trend of the aerosols during the experiment.

Link to supplemental information:
Crump, Flagan and Seinfeld, 1982:

Additional notes:

Characterization data file:

ID Name Start date Experiment Category Reaction Type Reactant(s) Oxidant Name Temperature Humidity Type of Seed RO2 Main Fate Data Sets (count) Actions
401 2014 FIXCIT Study_20140126_METHACROLEIN/nitrogen dioxide/methyl nitrite/methacrylic acid epoxide_Hydroxyl radical_Ammonium sulfate_Methacrolein + OH, high NO, dry, then humidify and add (NH4)2SO4 seed at end 2014-01-26 Gas phase chemical reaction, Aerosol formation Photooxidation METHACROLEIN, nitrogen dioxide, methyl nitrite, methacrylic acid epoxide Hydroxyl radical 26 5 Ammonium sulfate NO2 15 Download