Experiment: UCR-CECERT-APL-Cocker Group_20161021_SOA surrogate/NOx/H2O2_Hydroxyl radical_No Seed_EPA2268B - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161021_SOA surrogate/NOx/H2O2_Hydroxyl radical_No Seed_EPA2268B - Weihan
Date: 2016-10-21


EPA chamber

Experiment Set
VOC-Surrogate Experiments

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

targets: 0.55 ppmC SOA surrogate + 1 ppmc H2O2 + 25 ppb Nox + 100 ppb m-xylene(A) INSTRUMENTS: GC1, SMPS,VTDMA, HTDMA, AMS

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

20161021_EPA 2268 WP 0.55 ppmC SOA Surrogate + 1 ppm H2O2 + 25 ppb NOx + 100 ppb m-xylene (A)_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
7:24 Start NO|CO span flows 2.0 | 20 | 35.0 | off
7:41 Tecoxx2 NO 70.3 NOx 72.3 CO 16.16
7:42 Start GPT span flows 100 | 20 | 35.0 | 0.7
7:43 Fill air off - heaters on - air handlers on
7:50 Inject 400 uL H2O2 into both bags @ 60C
7:59 Tecoxx2 NO 48.8 NOx 70.3 CO 16.16
8:00 Start O3 span flows 2.0 | 20 | off | 0.7
8:16 Start NO 8.562-0.024 torr (253cc) into both bags
8:16 Start NO2 3.378-0.022 torr (370cc) into both bags
8:17 O3xx2 34.67
8:17 Start E--W--Z sampling
8:22 Start injecting 33 uL SOA surrogate into both bags
8:29 Inject 7.5 Acetaldehyde into both bags
8:33 Inject gas SOA surrogate into both bags @ 500 cc/min for 2:30 minutes
8:37 Mix W-E bags for 9 minutes
8:47 Close Valve 14
8:52 Inject 40 uL m-xylene into west bag
9:35 Internally mix west bag for 1 minute
10:00 BLs on heaters off
10:02 Elevator on (delta P=0.016")
16:51 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: