Experiment: Ng Research Group_20210919_ON/Cyclohexane_None_No Seed_BPN+NO3-1
Experiment
Name: Ng Research Group_20210919_ON/Cyclohexane_None_No Seed_BPN+NO3-1
Date: 2021-09-19
Organization
Ng Research Group
Chamber
Georgia Tech Environmental Chamber (Far)
Experiment Set
Photolysis_Takeuchi
Goals
To measure the photolysis rate constant of organic nitrates formed from NO3 radical oxidation of b-pinene and study their photolysis degradation mechanism.
Summary
SOA (including organic nitrates) was formed by reacting 3 ppm b-pinene with 320 ppb N2O5 in Chamber (Near) and was collected onto Teflon filter. Heated zero air was flown through the filter to vaporize SOA to introduce gaseous organic nitrates into Chamber (Far). 10 ppm cyclohexane was also injected to suppress OH radical oxidation. Photolysis of the gaseous organic nitrates was investigated via UV irradiation. Duplicate-1.Experiment Details
Categories:
- Gas phase chemical reaction
- Photolysis, any phase
Relative Humidity: 1-6
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 1-6
Reaction type:
Oxidant Name: None
Initial Oxidant Concentration Value: 0 (parts_per_million)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure:
Data Sets
| ID | Instrument | File | |
|---|---|---|---|
| 4580 | FIGAERO-HR-ToF-CIMS (far, gas, time series) |
20210919_CIMS_time.csv
|
Data Set plots
Experiment Set Details
Name: Photolysis_Takeuchi
Time format and units: Time is either ET or in min.
Description:
To measure photolysis rate constants of organic nitrates formed from OH and NO3 radical oxidation of a-pinene and b-pinene and study their photolysis mechanism.
Collaborators:
Contacts
Principal investigator:
Nga (Sally) Lee Ng
E-mail: ng@chbe.gatech.edu
OrcID: 0000-0001-8460-4765
Data Manager:
Taekyu Joo
Phone: (404) 385-2149
E-mail: tjoo6@gatech.edu
Reactants
| Reactant | Compound type | Concentration | Concentration units |
|---|---|---|---|
| ON | |||
| Cyclohexane (8078) | 10 | Parts Per Million |
20210919_TimeLine.csv
Timeline
| Time_min | Action |
| -152 | Inject 10 ppm cyclohexane |
| -140 | Start thermally desorbing SOA from filter |
| -80 | Stop thermally desorbing SOA from filter |
| 0 | UV on |
| 180 | UV off |
| 270 | End of experiment |
Characterizations
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)
Chamber Details
Name: Georgia Tech Environmental Chamber (Far)
Volume in cubic meters: 12.6
Shape:
Surface area in cubic meters: 32.48865
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness:
Replacement date: 2017-02-07
Replacement frequency: As needed
Cleaning method:
Flushing with air
Flushing with air with UV lights on
o3 background: 3
nox background: 1
Particle background in micrograms per cubic meter:
Air filtration method: Pure air generator with membrane filter dryer
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 4
Temparature range (max degrees celcius): 40
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 2
Relative humidity range (max percent): 70
Particle experiment capability: 1
Lights: Yes
Light source type(s):
UVA Black Lamps, Natural Sunlight
Supplemental information:
Additional Notes: