Experiment: Caltech Atmospheric Chamber_20140807_Methacrylolyl peroxynitrate(MPAN)/hydrogen peroxide_Hydroxyl radical_No Seed_Dry

Experiment

Name: Caltech Atmospheric Chamber_20140807_Methacrylolyl peroxynitrate(MPAN)/hydrogen peroxide_Hydroxyl radical_No Seed_Dry
Date: 2014-08-07

Organization
Caltech Atmospheric Chamber

Chamber
Near/Far Bag 2012-2015 (Tran)

Experiment Set
MPAN, Methacrolein, Isobutyraldehyde, and 231MBO photoxidation experiments

Goals
This experiment is a repeat of 140726, but done with the NO2PAN analyzer to get the exact concentration of MPAN. The photoxidation is wdone without a-pinene or MAE, to get the SOA yield.

Summary
The reaction produced a lot of SOA through dry nucleation.

Additional Notes
Equivalent to Exp#3 in the PCCP paper.

Experiment Details

Categories:

  • Gas phase chemical reaction
  • Aerosol formation
Temperature: 15
Relative Humidity: 4
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 4
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 1.5e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure: 750 Torr

Data Sets

ID Instrument File  
3476 CARMA SMPS 140807_dma_total.csv
3477 CIMS 140807_CIMS.csv
3478 O3NOxTRH 140807_gas_analyzers.csv
3479 NO2PANLum 140807_PANanalyzer.csv
3480 CARMA SMPS _ Number Distribution 140807_dma_wlcorr_Ndist.csv

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: MPAN, Methacrolein, Isobutyraldehyde, and 231MBO photoxidation experiments
Time format and units: Experiment time (minutes, local)
Description:
Photoxidation of synthesized methacryloyl peroxynitrate (MPAN) to understand its pathways of SOA formation, leading to 2-methylglyceric acid in the particle phase. It is hypothesized that MPAN produces an unstable intermediate called HMML (hydroxymethyl methyl-a-lactone) that ring opens when it hits a surface, with co-product NO3. Some experiments were done with alpha-pinene as an NO3 scavenger, with the production of pinene nitroxy hydroperoxide (PNP, m/z 316 C10H17NO5) evidence of the alpha-pinene + NO3 chemistry. Photoxidation of methacrolein (MACR) was performed for comparison. Photooxidation of 2-methyl-but-3-ene-1-ol (231MBO) and isobutyraldehyde were performed because they are (or can produce) analogous compounds that will give insight into the oxidation mechanism. Experiments were mainly performed dry and with no seeds, although 2 experiments were performed on with varying particle liquid water on ammonium sulfate (AS) seeds. Note that particle wall loss has already been applied to SMPS data, but the raw data are also provided as well as the wall loss kinetic parameters.

Collaborators:

  • Tran Nguyen UC Davis
  • Paul Wennberg Caltech

Download

Download this Experiment (199.69 KB)

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

Reactants

Reactant Compound type Concentration Concentration units
Methacrylolyl peroxynitrate(MPAN)
  • Alkene
    • peroxynitrate (PAN)
22 Parts Per Billion
hydrogen peroxide (784)
  • Hydroperoxide
 2 Parts Per Million

140807_Timeline.csv Timeline

Local time (hh:mm) Action (Time zero is "Lights On" time)
9:20 Chill bag to 15degC
9:32 Started instruments
10:53 Injecting H2O2 (110 uL of 50%wt or appox 2ppm)
11:40 Stop H2O2 injection
11:55 Injecting MPAN in tridecane (confirm can see it with NO2PAN instrument)
13:10 Done with MPAN injection (about 30 ppb)
13:25 Lights on 100%
17:55 Lights off
18:45 Filter collection started

Citations
Cite this experiment: Publication associated with this experiment:

Characterizations
Light Flux Characterizations:
2013-12-13 (#28)
Particle Loss Characterizations:
2013-03-06 (#29)
Vapor Loss Characterizations:
(None)

Chamber Details

Name: Near/Far Bag 2012-2015 (Tran)
Volume in cubic meters: 27
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:
Replacement frequency: As needed
Cleaning method: Flushing with air
o3 background: 0.5 ppb
nox background: 0.1 ppb for Near, > 0.1 ppb for Far
Particle background in micrograms per cubic meter: < 0.1 ug/m3
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: