Experiment: UCR-CECERT-APL-Cocker Group_20161019_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2267A - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161019_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2267A - Weihan
Date: 2016-10-19


EPA chamber

Experiment Set
VOC-Surrogate Experiments

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

targets: 2.2 ppmC SOA surrogate + 1 ppmc H2O2 + 25 ppb Nox + 100 ppb m-xylene(A) INSTRUMENTS: GC1, SIFT, 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 2.2 Parts Per Million
  • NOx
25 Parts Per Billion
H2O2 1 Parts Per Million
  • Aromatic
100 Parts Per Billion

20161019_EPA 2267 WP 2.2 ppmC SOA surrogate + 1ppm H2O2 + 25 NOx + 100 ppb m-xylene (A)_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
9:54 Start NO|CO span flows 2.0 | 20 | 35 | off
10:10 Tecoxx2 NO70.3 NOx 72.3 CO 16.25
10:11 Start GPT span flows 2.0 | 20 | 35 | 0.7
10:12 Fill air off - heaters on - air handlers on
10:19 Inject 600 uL H2O2 into both bags
10:27 Tecoxx2 NO 50.3 NOx 71.3 CO 16.36
10:28 O3 span flows 2.0 | 20 | off | 0.7
10:44 O3xx2 34.67
10:45 Start E--W--Z sampling
10:48 Inject NO 8.528-0.03 torr (253cc) into both bags
10:48 Inject NO2 3.417-0.032 torr (370cc) into both bags
10:55 Inject 132 uL liquid SOA surrogate into both bags
10:57 Inject 30 uL acetaldehyde into both bags
11:09 Inject gas SOA surrogate for 8:50 minutes @ 500cc/mm into both bags
11:20 Mix W-E bags for 10 minutes
11:30 Close valve 14
11:33 Inject 40 uL m-xylene into west bag
11:50 Internally mix West bag for 1 minute
12:05 BLs on heaters off
12:06 Elevators on (Delta P=0.016")
19:23 End 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: