Experiment: UCR-CECERT-APL-Cocker Group_20161026_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2269A - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161026_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2269A - Weihan
Date: 2016-10-26


EPA chamber

Experiment Set
VOC-Surrogate Experiments

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

targets: 4.4 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
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 4.4 Parts Per Million
  • NOx
25 Parts Per Billion
H2O2 1 Parts Per Million
  • Aromatic
100 Parts Per Billion

20161026_EPA 2269 4.4 ppmC SOA surrogate + 1ppm H2O2 + 25 ppb NOx + 100 ppb m-xylene (A)_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
7:35 NO span starts; flow 2|20|35.0|off
8:02 Teco xx2 NO 72.3 NO2 73.3 CO 16.36
8:03 GPT span starts; flow 2|20|35.0|0.7
8:05 Fill air off; Air Handlers on; Heaters on
8:10 Inject 400uL H2O2 into both bags
8:41 Tecoxx2 NO 50.8 NO2 73.3 CO 16.46
8:42 Start O3 span flow 20 | 2 | off | 0.7
8:44 Inject NO 8.504 - 0.031 torr (250 cc) to both bags
8:44 Inject NO2 3.361 - 0.23 torr (370 cc) to both bags
8:48 Inject 264 uL liquid SOA surrogate into both bags
8:52 Inject 60 uL acetaldehyde into both bags
8:57 O3xx2 35.89
8:58 Start E -- W -- Z sampling
9:00 Inject gas SOA surrogate into both bags for 18:40 minutes @ 100 cc/min
9:25 Mix W-E bags for 9 minutes
9:34 Close valve 14
9:40 Inject 40 uL m-xylene into west bag
10:04 Mix west bag for 60 seconds
10:10 Black lights on; heaters off
10:11 Elevators on (delta P=0.016")
16:30 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: