Experiment: UCR-CECERT-APL-Cocker Group_20150203_1,2,4-TRIMETHYLBENZENE/H2O2/NO_Hydroxyl radical_No Seed_EPA2019B - Sara


Name: UCR-CECERT-APL-Cocker Group_20150203_1,2,4-TRIMETHYLBENZENE/H2O2/NO_Hydroxyl radical_No Seed_EPA2019B - Sara
Date: 2015-02-03


EPA chamber

Experiment Set
Sara Li_Old test

Photo-oxidation of 1,2,4 TMB with initial OH and NO with continuous NO injection under black lights.

Target: 80ppb 124Trimethylbenzene+1ppm H2O2+20 ppb NO+ 5ppb/hr continous NO (A) INSTRUMENTS: SMPS, GC1, AMS, APM, SYFT

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: Not Sure
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
1,2,4-TRIMETHYLBENZENE (7247) 80 Parts Per Billion
H2O2 1 Parts Per Million
  • NOx
20 Parts Per Billion

20150203_EPA2019_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
8:16 NO span starts; flow 2|20|35|off
8:38 NO 86.91; NOx 88.38; CO 15.06; GPT span starts; flow 2|20|xx|0.7
8:59 NO 60.06; NOx 86.43; CO 15.04; O3 span starts; flow 2|20|off|0.7
9:28 Fill air off; Air Handlers on; Heaters on; Chiller #1 on
9:32 Inject 100 uL PFH to both bags
9:33 O3 34.67; Starting E--W--Z sampling
9:54 Inject 74 uL 124TMB to both bags
9:58 Inject 253cc (9.956-0.028) torr NO to both bags
10:21 Inject H2O2 380 uL to both bags
10:41 Mix E-W for 10 mins
10:55 Close valve 14
11:14 Open valve 14; 11:21 close -> test GC; open again 11:40
11:41 Inject 50 uL 124TMB to both bags
11:56 Mix E-W for 10 mins again
12:10 Close valve 14 again
12:33 BLs on; heater off
20:10 BLs off; air handler off; End experiment; W bottom E 247; 10.02" H2O

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: