Experiment: Caltech Atmospheric Chamber_20201110_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_Ammonium sulfate_C6
Experiment
Name: Caltech Atmospheric Chamber_20201110_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_Ammonium sulfate_C6
Date: 2020-11-10
Organization
Caltech Atmospheric Chamber
Chamber
Near Bag 2017
Experiment Set
D5 Chamber Experiments
Goals
Measure SOA yield of D5
Summary
Performed in the Caltech Near Bag, continuous injection of NO at a rate of about 1ppb/min, initial NO of 86 ppbExperiment Details
Categories:
- Aerosol formation
Relative Humidity: 5
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value:
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 4.3e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure:
Data Sets
| ID | Instrument | File | |
|---|---|---|---|
| 3597 | XMAN SMPS |
201110_NB_SMPS_Complete.csv
|
|
| 3598 | RHT Probe |
201110_NB_RHT.csv
|
|
| 3599 | CIMS |
201110_NB_CIMS.csv
|
|
| 3600 | GC - FID |
201110_NB_GC.csv
|
|
| 3601 | NOxTele |
201110_NB_NOx_O3.csv
|
Data Set plots
Experiment Set Details
Name: D5 Chamber Experiments
Time format and units:
Description:
Decamethylcyclopentasiloxane (D5, C10H30O5Si5) is measured at ppt levels outdoors and ppb levels indoors. Primarily used in personal care products, its outdoor concentration is correlated to population density. Since understanding the aerosol formation potential of volatile chemical products is critical to understanding particulate matter in urban areas, the secondary organic aerosol yield of D5 was studied under a wide range of OH concentrations and exposures using both batch-mode chamber and continuously run flow tube experiments. These results were comprehensively analyzed and compared to two other secondary organic aerosol (SOA) yield datasets from literature. It was found that the SOA yield from the oxidation of D5 is extremely dependent on the OH concentration or exposure.
Collaborators:
- Sophia M Charan Caltech
Contacts
Principal investigator:
John H Seinfeld
Phone: (626) 395-4635
E-mail: seinfeld@caltech.edu
OrcID: https://orcid.org/0000-0003-1344-4068
Data Manager:
Stephanie Kong
Phone: 626-395-3194
E-mail: wkong@caltech.edu
Reactant
| Reactant | Compound type | Concentration | Concentration units |
|---|---|---|---|
| DECAMETHYLCYCLOPENTASILOXANE (10913) | 650 | Parts Per Billion |
201110_NB_TimeLine.csv
Timeline
| Time (America/Los_Angeles) | Action |
| 11/10/2020 06:43:30 | RHT/NOx/O3 on |
| 11/10/2020 08:01:51 | CIMS on |
| 11/10/2020 08:05:30 | SMPS on |
| 11/10/2020 09:27:58 | GC on |
| 11/10/2020 10:40:00 | Time background starts |
| 11/10/2020 14:44:00 | Lights on |
| 11/10/2020 21:38:32 | GC off |
| 11/10/2020 21:42:01 | DMA off |
| 11/10/2020 21:46:47 | CIMS off |
| 11/10/2020 22:10:00 | RHT/Nox/O3 off |
Citations
Characterizations
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)
Chamber Details
Name: Near Bag 2017
Volume in cubic meters: 19
Shape: Rectangular Prism
Surface area in cubic meters: 41.8
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 50
Replacement date: 2017-08-08
Replacement frequency: As needed
Cleaning method:
Flushing with air
o3 background:
nox background: 0.1
Particle background in micrograms per cubic meter: 0
Air filtration method: Custom Filter
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 20
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 5
Relative humidity range (max percent): 100
Particle experiment capability: 1
Lights: Yes
Light source type(s):
UVA Black Lamps
Supplemental information: https://www.worldscientific.com/doi/abs/10.1142/9789813147355_0001
Additional Notes: