Experiment: Nguyen Group_20211129_None_Ammonium sulfate


Name: Nguyen Group_20211129_None_Ammonium sulfate
Date: 2021-11-29

Nguyen Group

Tran's big bag of air

Experiment Set
Ammonium sulfate + isoprene diol

This experiment serves as a no-organic control for experiments on 11/16/21 and 11/19/21, to examine the dark size-dependent loss rates of ammonium sulfate aerosol in the chamber while filter collection is in progress.

The chamber was humidified to ~80% RH; ammonium sulfate was introduced by atomization. Filter collection proceeded for ~6 hours and particle loss rates were measured during that time.

Experiment Details


  • Volatility and partitioning
  • Instrument/Chamber characterization
  • Blank/Control
Temperature: 20-22
Relative Humidity: 84
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 2700
Seed Concentration Units: micrograms_per_cubic_meter
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 84
Reaction type:
Oxidant Name: None
Initial Oxidant Concentration Value: 0 (parts_per_million)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: Ammonium sulfate + isoprene diol
Time format and units: HH:MM, local time
Two experiments and three controls to examine the photochemistry of isoprene diol (1,2-dihydroxy-2-methylbut-3-ene) in ammonium sulfate aerosol.


  • Kelvin Bates Harvard / UC Davis


Principal investigator:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Kelvin H. Bates
E-mail: kelvinhbates@gmail.com

211129_timeline.csv Timeline

Time_local_HHMM Action
8:55 Start humidifying
8:55 Chamber temp control on
9:15 RH/T/NOx/O3 monitors on; SMPS on
9:22 CIMS on
9:42 stop humidifying
9:43 start seed aerosol injection (with 35 psi N2 through wet heated denuder)
10:58 turn on mixing air (dry) for last 5 min of atomization
11:03 turn off atomization & mixing air; start filter collection
17:00 shut down

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: Tran's big bag of air
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 28
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent):
Relative humidity range (max percent):
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV broadband black lights (centered at 350 nm)
Supplemental information:
Additional Notes: 40-Watt, Osram/Sylvania 350nm black lights, 48” long, T12 fluorescent; 72 bulbs, 36 each on two facing walls, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall - top, mid, bottom - and 3 equivalent on the left wall).