Experiment: UCR-CECERT-APL-Cocker Group_20110110_Isoprene/Nitric oxide/Hydrogen peroxide_Hydroxyl radical_No Seed_EPA1353A - Chris


Name: UCR-CECERT-APL-Cocker Group_20110110_Isoprene/Nitric oxide/Hydrogen peroxide_Hydroxyl radical_No Seed_EPA1353A - Chris
Date: 2011-01-10


EPA chamber

Experiment Set
Unclassified experiment

Photochemical reaction of isoprene with NOx and OH

Targets: isoprene 0.250 ppm both NOx 0.5 ppm both H2O2 3 ppm West 1.5 ppm East INSTRUMENTS: PILS-ToF (- ionization), GC, SMPS, vTDMA, APM

Additional Notes
vTDMA and APM started late

Experiment Details


  • Photolysis, any phase
  • Aerosol formation
  • Aerosol aging
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: Unclassified experiment
Time format and units: Time format in timeline is the absolute local time.
Unclassified experiments from the new batch on Jan 2022


  • Chen Le


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 (6557) 250 Parts Per Billion
Nitric oxide (145068)
  • NOx
500 Parts Per Billion
Hydrogen peroxide (784) 3 Parts Per Million

20110110_EPA1353_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
6:12 NO/CO span starts; flow 2|40|40|off
6:25 NO 116.80; NOx 115.04; GPT span starts; flow 2|40|40|0.7
6:40 NO 26.46; NOx 111.04; O3 span starts; flow 2|40|off|2
7:00 O3 82.76; Starting E--W--Z sampling
7:30 Note: Chambers have a background particle mess off
7:40 Inject 172.5uL isoprene into East bag
7:48 Injected 57 torr from 1.0891 L bulb of NO into both
7:53 Fill air off; Turned on West air; Air handler on; Heater on
7:54 Mix W-E bag for 5 mins
8:05 Mix W-E bag for 5 mins
8:15 Close valve 14
8:17 Inject 300uL H2O2 into East bag
8:31 Inject 400uL H2O2 into West bag
8:45 Inject 200uL H2O2 into West bag
9:02 Blacklights on (13 lights out)
14:21 Start k1 measurement (zero)
14:23 Turn all blacklight off
14:31 k1 NO 3.4 (zero); NO2 0.9 (zero); Start k1 NO span; Air 2.01 pm; NO 40.0 ccm
14:39 k1 NO 9.90; NO2 6.3
14:41 Start k1 measurement (dark)
14:51 k1 NO 64.6; NO2 13.97
14:56 Start k1 measurement (BL2) (BL2 on; 14 bulbs our); Note: ~10cm of teflon tube was exposed
15:08 k1 NO 4.70; NO2 10.04
15:19 k1 NO 4.67; NO2 10.09
15:20 Blacklight off

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: