Experiment: UCR-CECERT-APL-Cocker Group_20161220_SOA surrogate/NOx/H2O2_Hydroxyl radical_No Seed_EPA2291B - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161220_SOA surrogate/NOx/H2O2_Hydroxyl radical_No Seed_EPA2291B - Weihan
Date: 2016-12-20


EPA chamber

Experiment Set
VOC-Surrogate Experiments

Observing OH-initiated m-xylene reactions under SOA surrogate and NOx environment.

Target: 1.1 ppmC SOA surrogate, 25 ppb Nox, 1 ppm H2O2, 25 ppb m-xylene(A) INSTRUMENTS: SMPS, GC1, AMS, VTDMA, HTDMA, APM

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 1.1 Parts Per Million
  • NOx
25 Parts Per Billion
H2O2 1 Parts Per Million

20161220_EPA2291_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
9:07 NO span starts; flow 2|20|off|35
9:30 NO 83.98; NOx 84.45; CO 17.53; GPT span starts; flow 2|20|0.7|35
9:44 Fill air off; Air Handlers on; Heaters on; Chiller #1 on
9:45 Inject NO 57.62 - 0.049 torr (253 cc) to both bags
9:45 Inject NO2 5.272 - 0.027 torr (253 cc) to both bags
9:51 Inject 66 uL SOA sur into both bags
9:52 NO 57.62; NOx 82.52; CO 17.14; O3 span starts; flow 2|20|0.7|off
9:58 Inject 15 uL acetaldehyde into both bags
10:03 Inject gas SOA sur into both bags @ 500 cc/min for 4:42
10:08 O3 35.8; Starting E--W--Z sampling
10:09 Internally mix W bag for 1 min
10:23 Inject 400 uL H2O2 into both bags
10:37 Mix W-E bag for 8 mins
10:46 Close valve 14
10:52 Inject 10 uL m-xylene into W bag
11:10 Heaters off; Blacklights on
15:51 End of experiment; AMS airbeam dropped @~12:30

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: