Experiment: UCR-CECERT-APL-Cocker Group_20161102_NOx/Summer Gasoline (Mobil 91)/SOA Surrogate/H2O2_Hydroxyl radical_No Seed_EPA2270A - Weihua&Wenfu


Name: UCR-CECERT-APL-Cocker Group_20161102_NOx/Summer Gasoline (Mobil 91)/SOA Surrogate/H2O2_Hydroxyl radical_No Seed_EPA2270A - Weihua&Wenfu
Date: 2016-11-02


EPA chamber

Experiment Set
Weihua Li Experiments

Gasoline photo-oxidation under NOx and SOA surrogate

Target: 1.1ppmC SOA surrogate, 25ppb NOx, 500ul Gasoline(Both)+1ppmC H2O2(both) INSTRUMENTS: SMPS, GC1, AMS, VTDMA, HTDMA

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: Weihua Li Experiments
Time format and units: Time format in timeline is the absolute local time.
Previous student experiments -- Weihua Li


  • Weihua Li


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
  • NOx
25 Parts Per Billion
Summer Gasoline (Mobil 91) 9999 Microgram Per Cubic Meter
SOA Surrogate 1.1 Parts Per Million
H2O2 1 Parts Per Million

20161102_EPA2270_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
8:47 NO span starts; flow 2|20|off|35.0
9:02 NO 71.29; NOx 73.24; CO 16.26; GPT span starts; flow 2|20|0.7|35.0
9:20 Fill air off; Air Handlers on; Heaters on; Chiller #1 on
9:21 NO 50.78; NOx 72.75; CO 16.35; O3 span starts; flow 2|20|0.7|off
9:36 Inject 400 uL H2O2 into both bags
9:40 O3 36.87; Starting E--W--Z sampling
9:59 Inject NO 8.605 - 0.038 torr (253 cc) to both bags
9:59 Inject NO2 5.22 - 0.036 torr (253 cc) to both bags
10:14 Inject gas phase surrogate into both bags @ 500 cc/min for 4:42 mins
10:52 Inject 100 uL PFH into both bags
10:54 Inject 66 uL liquid surrogate into both bags
10:55 Inject 15 uL acetaldehyde into both bags
11:02 Inject 500 uL gasoline (Mobile 91) into both bags
11:17 Mix W-E bag for 8 mins
11:25 Close valve 14
11:26 Heaters off; Blacklights on
11:28 Elevators on (0.015'')
18:08 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: