Experiment: UCR-CECERT-APL-Cocker Group_20161011_NOx/Diesel(Shell)/SOA Surrogate/H2O2_Hydroxyl radical_No Seed_EPA2262A - Weihua


Name: UCR-CECERT-APL-Cocker Group_20161011_NOx/Diesel(Shell)/SOA Surrogate/H2O2_Hydroxyl radical_No Seed_EPA2262A - Weihua
Date: 2016-10-11


EPA chamber

Experiment Set
Weihua Li Experiments

Diesel photo-oxidation under NOx and SOA surrogate

1.1ppmc surrogate +12.5ppb NOx +150ul (shell) diesel+1ppmc H2O2 INSTRUMENTS: AMS, SMPS, GC1, HTDMA, VTDMA

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
12.5 Parts Per Billion
Diesel(Shell) 9999 Microgram Per Cubic Meter
SOA Surrogate 1.1 Parts Per Million
H2O2 1 Parts Per Million

20161011_EPA2262_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
7:42 NO span starts; flow 2|20|off|35
7:58 NO 67.96; NOx 64.45; CO 15.19; GPT span starts; flow 2|20|0.7|35
8:13 NO 64.43; NOx 44.92; CO 15.28; O3 span starts; flow 2|20|0.7|off
8:20 Fill air off; Air Handlers on; Heaters on; Chiller #1 on
8:22 Inject 100 uL PFH into both bags
8:23 Inject NO 4.29 - 0.03 torr (253cc) into both bags
8:23 Inject NO2 2.569 - 0.023 torr (253cc) into both bags
8:25 Inject 66 uL liquid surrogate into both bags
8:26 Inject 15 uL acetaldehyde into both bags
8:29 O3 31.79; Starting E--W--Z sampling
8:33 Inject gas phase surrogate @500 to both bag for 4:42 min
8:47 Inject 400 uL H2O2 into both bag
9:07 Mix W-E bag for 8 mins
9:16 Close valve 14
9:17 Inject 150 uL diesel into W bag @40 V 60~70 C
9:18 Internally mix W bag for 1 min
11:08 Heaters off; Blacklights on; Elevators on
11:09 Elevator program deltaP = 0.015
17:46 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: