Experiment: UCR-CECERT-APL-Cocker Group_20170425_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2297A - Weihan


Name: UCR-CECERT-APL-Cocker Group_20170425_SOA surrogate/NOx/H2O2/M-XYLENE_Hydroxyl radical_No Seed_EPA2297A - Weihan
Date: 2017-04-25


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

Additional Notes
NOx was not fully injected SMPS treated data lost/not available

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

20170125_EPA2297_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
9:10 NO span starts; flow 2|20|off|35
9:36 NO 85.9; NOx 86.9; CO 18.4; GPT span starts; flow 2|20|0.7|35
9:38 Fill air off; Air Handlers on; Heaters on; Chiller #1 on
9:53 NO 59.6; NOx 87.4; O3 span starts; flow 2|20|0.7|off
10:00 Inject NO 8.587 - 0.025 torr (253 cc) to both bags
10:00 Inject NO2 5.278 - 0.027 torr (253 cc) to both bags
10:10 Inject 66 uL SOA sur into both bags
10:11 O3 32.7; Starting E--W--Z sampling
10:31 Close valve 14
10:32 Inject gas SOA sur into both bags @ 500 cc/min for 4:30 mins
10:38 Inject 15 uL acetaldehyde into both bags
11:00 Inject 380 uL H2O2 into both bags @ 55 C
11:21 Mix W-E bag for 10 mins
11:35 Inject 10 uL m-xylene into W bag
11:54 Internally mix W bag for 1 min
12:00 Heaters off; Blacklights on
12:01 Elevators on (0.015'')
16:25 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: