Experiment: UCR-CECERT-APL-Cocker Group_20110415_ISOPRENE/H2O2/NOx_Hydroxyl radical_No Seed_EPA1411B - Chris


Name: UCR-CECERT-APL-Cocker Group_20110415_ISOPRENE/H2O2/NOx_Hydroxyl radical_No Seed_EPA1411B - Chris
Date: 2011-04-15


EPA chamber

Experiment Set
Sara Li_Old test

Photo-oxidation of isoprene with OH with the existence of NOx under black lights

Targets: isoprene 0.250 ppm both NOx 0.250 ppm both H2O2 3 ppm West 1.5 ppm East INSTRUMENTS: PILS-ToF (- ionization), GC, SMPS, vTDMA, APM, AMS

Experiment Details


  • Photolysis, any phase
  • Aerosol formation
  • Aerosol aging
  • Blank/Control
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: HO2
RO2 Lifetime: (Seconds)
Pressure: 0.015'' H2O

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: Sara Li_Old test
Time format and units:
To investigate the SOA yield from DEGEE in low NOx condition.



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
ISOPRENE 250 Parts Per Billion
H2O2 1.5 Parts Per Million
  • NOx
0.25 Parts Per Million

20110415_EPA 1411 Isoprene + NO + H2O2_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
06:00 Targets: isoprene 250 ppb both; NO 250 ppb both; H2O2 3 ppm west 1.5 ppm east
06:10 Teco2 NO 125.24 ppb; NOx 124.02 ppb; CO 9.71 ppm; NO span starts; flow 2|40|off|40
06:15 Changed NOx box scale to 500ppb
06:33 NO 26.37 ppb; NOx 114.50 ppb; GPT span starts; flow 2|40|2|40
06:47 O3 #2 85.94 O3 span starts; flow 2|40|2|off
07:33 Starting E--W--Z sampling
10:48 Fill air off
10:50 Inject 100uL PF into both bags
10:52 Turn on air handler and chiller
10:57 Inject 172.5uL isoprene into both bags
11:09 Inject NO 28.5 torr (1089 cc bulb) to both bags
11:10 Mix W-E bag for 4 mins
11:19 Mix A for 4 minutes
11:29 Close valve 14
11:32 Inject 300 uL 50% w/w H2O2 into East bag
11:46 Inject 400 uL 50% w/w H2O2 into West bag
11:58 Inject 200 uL 50% w/w H2O2 into West bag
12:10 All Blacklights on (6 lights out) Note: O3 off scale ~778ppb
23:59 All black lights off; East only lasted 6 hours; West lasted 8 hours

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: