Experiment: UCR-CECERT-APL-Cocker Group_20161103_SOA surrogate/NOx/ISOPRENE_Hydroxyl radical_No Seed_EPA2271A - Weihan


Name: UCR-CECERT-APL-Cocker Group_20161103_SOA surrogate/NOx/ISOPRENE_Hydroxyl radical_No Seed_EPA2271A - Weihan
Date: 2016-11-03


EPA chamber

Experiment Set
VOC-Surrogate Experiments

Observing NO-initiated isoprene reactions under SOA surrogate and NOx environment.

Target: 1.1ppmC SOA surrogate, 25ppb Nox, 50 ppb isoprene (A) 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: 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
  • Aromatic
50 Parts Per Billion

20161103_EPA2271_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
10:21 NO span starts; flow 2|20|off|35
10:36 NO 73.7; NOx 75.7; CO 16.55; GPT span starts; flow 2|20|0.7|35
10:51 NO 53.7; NOx 73.7; CO 16.55; O3 span starts; flow 2|20|0.7|off
10:55 Inject gas SOA sur @ 500 cc/min for 4:20
11:05 Inject NO 8.497 - 0.03 torr (253 cc) to both bags
11:05 Inject NO2 1.396 - 0.03 torr (207.7 cc) to both bags
11:08 Inject 66 uL SOA sur into both bags
11:10 Inject 15 uL acetaldehyde into both bags
11:11 O3 xx2 35.89
11:12 Start E-W-Z cycling
11:22 Mix W-E bag for 9 mins
11:32 Close valve 14
12:01 Internally mix W bag for 1 min
12:15 Heaters off; Blacklights on
12:15 Elevators on (0.0165'')
17:50 End of experiment (W:339s; E:361s)

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: