Experiment: Nguyen Group_20190923_ALPHA-PINENE/OZONE/10102-44-0/hydrogen peroxide_Nitrate radical_Ammonium sulfate

Experiment

Name: Nguyen Group_20190923_ALPHA-PINENE/OZONE/10102-44-0/hydrogen peroxide_Nitrate radical_Ammonium sulfate
Date: 2019-09-23

Organization
Nguyen Group

Chamber
Tran's big bag of air

Experiment Set
a-pinene nighttime chemistry

Goals
To quantify the nitrooxy-hydroperoxide yield and the SOA yield from nighttime RO2+HO2-dominated NO3-initiated chemistry of a-pinene by adding H2O2 + ozone + NO2 to the chamber. Part of a series of varying initial reactant concentrations slightly to target different chemical pathways. This one targeted high initial RO2 by adding more pinene than others.

Summary
H2O2, NO2, and O3 were injected in the chamber and allowed to equilibrate, forming NO3 (and some N2O5) and probably HO2. Ammonium sulfate seed particles were injected. Then a-pinene was injected and decayed by simultaneous reaction with ozone and NO3. Gas phase was monitored by CF3O- CIMS and particle formation by SMPS.

Experiment Details

Categories:

  • Gas phase chemical reaction
  • Aerosol formation
Temperature: 22
Relative Humidity: 5
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 25
Seed Concentration Units: micrograms_per_cubic_meter
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Nitrate radical
Initial Oxidant Concentration Value: 150 (parts_per_trillion)
RO2 Main Fate: RO2
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

Data Sets

ID Instrument File  
2274 T/RH/O3/NOx 190923_RHTNOxO3.csv
2275 SMPS - bulk, wall loss corrected 190923_SMPS_corr.csv
2276 SMPS - bulk, uncorrected 190923_SMPS_uncorr.csv
2277 CF3O- CIMS: negative mode, raw spectra 190923_CIMS_neg.csv
2278 CF3O- CIMS: positive mode, raw spectra 190923_CIMS_pos.csv

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

Experiment Set Details

Name: a-pinene nighttime chemistry
Time format and units: HH:MM, local time
Description:
A series of experiments examining product yields and SOA formation from a-pinene + NO3 under conditions spanning a range of RO2 fates and under conditions designed to mimic the nighttime chemistry of the Southeast US in the summer. Two types of experiments are included: those in which the chemistry is initiated by addition of N2O5, which provides an easy NO3 source but tends to deviate from ambient conditions (i.e., no HO2 or ozone, and usually extremely high NO3 and/or RO2), and those in which the chemistry is initiated with O3 + NO2 + H2O2, which together provide conditions more closely resembling the ambient atmosphere at night (i.e., with HO2 and ozone in addition to NO3 and pinene) but have much more complex chemistry to untangle (simultaneous a-pinene + NO3, a-pinene + O3, and a-pinene + OH oxidation). For each experiment initiated with O3 + NO2 + H2O2, an additional control experiment without NO2 was run to account for this complex "background" (non-NO3) chemistry.

Collaborators:

  • Kelvin H Bates Harvard / UC Davis

Download

Download this Experiment (62.19 KB)

Contacts

Principal investigator:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Kelvin H. Bates
E-mail: kelvinhbates@gmail.com

Reactants

Reactant Compound type Concentration Concentration units
ALPHA-PINENE (6654)
  • Alkene
  • Cycloalkene
 55 Parts Per Billion
OZONE (24823) 45 Parts Per Billion
10102-44-0 (3032552)
  • NOx
 120 Parts Per Billion
hydrogen peroxide (784) 2 Parts Per Million

190923_timeline.csv Timeline

Time_HH:MM Action
10:09 Cap bag
10:28 Inject seeds 9.5 min
10:46 Inject seeds 30 sec
10:48 Inject NO2 2.5 min
11:02 Inject O3 2 min 20 sec
11:13 Inject H2O2
11:27 CIMS on
12:10 Inject a-pinene
12:49 Start filter collection
14:20 Stop filter

Citations
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Characterizations
Light Flux Characterizations:
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)

Chamber Details

Name: Tran'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:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent):
Relative humidity range (max percent):
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 each on two facing walls, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall - top, mid, bottom - and 3 equivalent on the left wall).