ID:
14

Name:
RH20_22celsius_NearBag

Instrument:
Scanning Mobility Particle Sizer Particle Loss (#355)

Chamber:
Seinfeld chambers

Temperature (°C):
22

Relative humidity (%):
20

Particle composition:

• Ammonium sulfate

Particle measurement size range:
17-952

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

Date of characterization experiment:
2013-03-14

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: https://www.tandfonline.com/doi/pdf/10.1080/02786828308958636?needAccess=true

Additional notes:

Characterization data file:
Wallloss_Particle_RH20_22celsius_NearBag_130314.csv