Experiment: UCR-CECERT-APL-Cocker Group_20161013_SOA surrogate/NOx_Hydroxyl radical_No Seed_EPA2264A - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161013_SOA surrogate/NOx_Hydroxyl radical_No Seed_EPA2264A - Weihan
Date: 2016-10-13


EPA chamber

Experiment Set
VOC-Surrogate Experiments

Observing ground reactions between SOA surrogate and NOx; Check chamber bag and cleaning

Target: 2.2 ppmC SOA surrogate + 25 ppb Nox INSTRUMENTS: SMPS, GC1

Experiment Details


  • Photolysis, any phase
  • Blank/Control
Temperature: 28
Relative Humidity: 0.01
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0.01
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: N/A (molecules_per_cubic_centimeter)
RO2 Main Fate: NO
RO2 Lifetime: (Seconds)
Pressure: 0.015'' H2O

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

Experiment Set Details

Name: VOC-Surrogate Experiments
Time format and units: Time format in timeline is the absolute local time.
Experiments involved with SOA surrogates.


  • Weihan Peng
  • Weihua Li
  • Mary Kacarab


Principal investigator:

David Cocker
E-mail: dcocker@engr.ucr.edu

Data Manager:

Chen Le
Phone: 9516603455
E-mail: cle030@ucr.edu


Reactant Compound type Concentration Concentration units
SOA surrogate 2.2 Parts Per Million
  • NOx
25 Parts Per Billion

20161013_EPA2264_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
10:23 Fill air off; heaters on; air handlers on
10:31 Inject gas phase SOA surrogate into both bags @500 for 9:05 min
10:56 Inject NO 8.277 - 0.03 torr (253cc) into both bags
10:56 Inject NO2 3.159 - 0.035 torr (350cc) into both bags
11:03 Inject 100 uL PFB into both bags
11:04 Inject 132 uL liquid surrogate into both bags
11:11 Inject 30 uL acetaldehyde into both bags
11:20 Mix E-W bags for 10 mins
11:32 Close valve 14
11:33 BLs on; heater off
11:35 Elevator on (0.0175)
17:56 End of experiment

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

Chamber Details

Name: EPA chamber
Volume in cubic meters: 84.2
Shape: Rectangular Prism
Surface area in cubic meters: 126
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date: 2017-11-07
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation Wipe with ultra-pure water if needed
o3 background: 10
nox background: 0
Particle background in micrograms per cubic meter: 0
Air filtration method: The chamber is using zero air from our air purification system
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 5
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 0.01
Relative humidity range (max percent): 80
Particle experiment capability: 1
Lights: Yes
Light source type(s): 350nm UVA Black Lamps
Supplemental information:
Additional Notes: