Experiment: Kelvin's lab_20220114_2-Methylbut-3-ene-1,2-diol/Hydrogen peroxide/Ammonium sulfate_Hydroxyl radical_Ammonium sulfate_RH50
Experiment
Name: Kelvin's lab_20220114_2-Methylbut-3-ene-1,2-diol/Hydrogen peroxide/Ammonium sulfate_Hydroxyl radical_Ammonium sulfate_RH50
Date: 2022-01-14
Organization
Kelvin's lab
Chamber
Kelvin's big bag of air
Experiment Set
1,2-dihydroxy isoprene oxidation
Goals
Product and SOA formation study on 2-methylbut-3-ene-1,2-diol (1,2-DHI) + OH, using wet (deliquesced) ammonium sulfate seeds at 50% RH. RO2 + HO2 pathway targeted.
Summary
1,2-DHI and H2O2 were injected. AS solution was atomized, and lights were then turned on to initiate photooxidation. The CIMS died briefly (~10 minutes) at 12:20. Note that the NOx and O3 monitors sampled the room air, instead of the chamber, for 1 hour starting at 10:00amExperiment Details
Categories:
- Gas phase chemical reaction
- Aerosol formation
Relative Humidity: 50
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 250
Seed Concentration Units: micrograms_per_cubic_meter
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 50
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 3e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure: 755 Torr
Data Sets
| ID | Instrument | File | |
|---|---|---|---|
| 4129 | SMPS |
210114_O3NOxRHT.csv
|
Data Set plots
Experiment Set Details
Name: 1,2-dihydroxy isoprene oxidation
Time format and units: HH:MM, local time
Description:
A series of experiments to investigate the gas-phase oxidation rate of 1,2-dihydroxy isoprene, its oxidation products via various RO2 pathways, and the effects of including seed (AS = ammonium sulfate) particles both on observed gas-phase products and on SOA formation
Collaborators:
Contacts
Principal investigator:
Kelvin Bates
E-mail: khbates@ucdavis.edu
Data Manager:
Kelvin Bates
E-mail: khbates@ucdavis.edu
timeline_210114.csv
Timeline
| Time_local_HHMM | Action |
| 9:00 | Start humidifying |
| 9:12 | SMPS on |
| 9:28 | CIMS on |
| 9:45 | Stop humidifying; start injections (H2O2 + AS seed + DHI) |
| 10:00 | Stop seed injection |
| 10:15 | All injections stopped; burst mixing air; let it equilibrate |
| 11:00 | 100% lights on |
| 12:23 | CIMS computer died; ~10 minutes of data missing |
| 12:40 | Lights off |
| 14:42 | Start DNPH filter |
| 14:53 | Stop DNPH; instruments off |
Citations
Characterizations
(None)
Particle Loss Characterizations:
2022-08-24 (#34)
Vapor Loss Characterizations:
(None)
Chamber Details
Name: Kelvin's big bag of air
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 28
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date: 2022-08-24
Replacement frequency: As needed
Cleaning method:
Flushing with air
Flushing with air with UV lights on
Oxidation
o3 background: <0.5 ppb
nox background: <0.1 ppb
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, paricles, ozone, SOx from pressurized ambient air
Mixing method: 1
Mixing method material: Pulsed air, jets manually activated
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): 2
Relative humidity range (max percent): 85
Particle experiment capability: 1
Lights: Yes
Light source type(s):
UV broadband black lights (centered at 350 nm)
Supplemental information:
Additional Notes: 40-Watt Osram/Sylvania 350nm black lights, 48" long, T12 fluorescent; 72 bulbs, 36 on two facing walls each, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall, 3 on the left).