Experiment: Hildebrandt Ruiz Lab_20170205_ISOPRENE_Chlorine radical_Ammonium sulfate_A1_neutral seed
Experiment
Name: Hildebrandt Ruiz Lab_20170205_ISOPRENE_Chlorine radical_Ammonium sulfate_A1_neutral seed
Date: 2017-02-05
Organization
Hildebrandt Ruiz Lab
Chamber
LHR Chamber
Experiment Set
Isoprene + Cl
Goals
To calculate SOA yield from Cl-initiated photo-oxidation of isoprene at a VOC:Cl2 ratio of 0.60, and using neutral seed.
Summary
Neutral seed was injected with an initial seed surface area of 1500 um2/cm3, followed by a Cl2 injection out of a gas cylinder, and the isoprene injection using a heated glass bulb. Temperature was kept at 25C for the whole duration of the experiment, while RH was kept at less than 10%. H2SO4 was injected halfway through the lights-on period (at 14:52).Experiment Details
Categories:
- Gas phase chemical reaction
- Volatility and partitioning
- Aerosol formation
Relative Humidity: 0
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 1500
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0
Reaction type:
Oxidant Name: Chlorine radical
Initial Oxidant Concentration Value: 40 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure:
Data Sets
| ID | Instrument | File | |
|---|---|---|---|
| 1028 | Labview |
A1_2017_02_05_Labview.csv
|
|
| 1029 | CAPS NO2 monitor |
A1_2017_02_05_NO2_.csv
|
Data Set plots
Experiment Set Details
Name: Isoprene + Cl
Time format and units:
Description:
Environmental chamber experiments were carried out under low-NOx conditions with isoprene and chlorine as primary VOC and oxidant sources. Secondary organic aerosol yields were calculated upon complete isoprene consumption. Formation of particulate organochloride was tracked using an ACSM. A high-resolution time-of-flight chemical ionization mass spectrometer was used to determine the molecular composition of gas-phase species using iodide–water and hydronium–water cluster ionization.
Collaborators:
- Dongyu S. Wang University of Texas at Austin, now at Paul Scherrer Institute in Switzerland
- Lea Hildebrandt Ruiz University of Texas at Austin
Contacts
Principal investigator:
Lea Hildebrandt Ruiz
E-mail: lhr@che.utexas.edu
OrcID: 0000-0001-8378-1882
Data Manager:
Lea Hildebrandt Ruiz
E-mail: lhr@che.utexas.edu
Reactant
| Reactant | Compound type | Concentration | Concentration units |
|---|---|---|---|
| ISOPRENE (6557) | 24 | Parts Per Billion |
A1_timeline.csv
Timeline
| Time (HH:MM) | Event description |
| 11:30 | NOx, NO2 and O3 analyzer turned on |
| 11:40 | Turned on Presssure controller |
| 12:17 | Starting AS seed injection |
| 12:22 | Injecting 1 ul isoprene |
| 12:47 | Number conc. on SEMS after AS seed injection is 74E3 /cm3 |
| 13:00 | Injection of 4 L chlorine, setting FIGAERO excess flow at 0.4 LPM for gas + 1.6 LPM for particle assist. for 10 mins |
| 13:21 | UV on (5/5) |
| 14:52 | Injecting H2SO4 seed |
| 15:49 | UV off (5/5) |
Citations
Characterizations
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)
Chamber Details
Name: LHR Chamber
Volume in cubic meters: 8.92
Shape: Rectangular Prism
Surface area in cubic meters: 26.4
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 5.0
Replacement date: 2018-06-15
Replacement frequency: As needed
Cleaning method:
Flushing with air
Flushing with air with UV lights on
Oxidation
o3 background:
nox background:
Particle background in micrograms per cubic meter: < 10 counts/cm3
Air filtration method: NA
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 5
Temparature range (max degrees celcius): 50
Humidity Control: No
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 0
Relative humidity range (max percent): 85
Particle experiment capability: 1
Lights: Yes
Light source type(s):
UV-A Blacklight
Supplemental information:
Additional Notes: