Experiment: Ng Research Group_20220718_alpha-Pinene/Limonene_Nitrate radical_Ammonium sulfate_SEQ-2


Name: Ng Research Group_20220718_alpha-Pinene/Limonene_Nitrate radical_Ammonium sulfate_SEQ-2
Date: 2022-07-18

Ng Research Group

Georgia Tech Environmental Chamber (Far)

Experiment Set

To evaluate whether or not the formation and properties of secondary organic aerosol (SOA) formed via sequential oxidation of a-pinene followed by limonene can be described as linear combinations of pure a-pinene and limonene systems. Repeat experiment.

2 uL of liquid a-pinene was injected, followed by the injection of 100 ppb of N2O5 (source of nitrate radical) at a rate of 11.3 ppb min-1. After 60 min since the start of N2O5 injection, 0.4 uL of liquid limonene was injected, followed by the additional injection of 40 ppb of N2O5 (source of nitrate radical) at a rate of 11.3 ppb min-1.

Additional Notes
Initial oxidant concentration is the injected N2O5 concentration. The limonene concentration is estimated based on the chamber volume and the limonene injection volume. In a separate day, the initial chamber volume was determined to be 11.3 m3 by injecting the known concentration of NO and NO2. The chamber volume at the time of limonene injection was estimated by subtracting the sum sampling rate of all the instruments and adding the injection rate of a-pinene, N2O5, and seed aerosol.

Experiment Details


  • Gas phase chemical reaction
  • Condensed-phase chemical reaction
  • Volatility and partitioning
  • Aerosol formation
Temperature: 5
Relative Humidity: 0-2
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value:
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0-2
Reaction type:
Oxidant Name: Nitrate radical
Initial Oxidant Concentration Value: 140 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)

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

Experiment Set Details

Name: MultiPrecursor_Takeuchi
Time format and units: Time is either ET or in min.
To understand whether or not the formation and properties of secondary organic aerosol (SOA) in multi-precursor systems can be described linearly using respective single-precursor systems. The system to investigate is nitrate radical oxidation of a-pinene and limonene.



Principal investigator:

Nga (Sally) Lee Ng
E-mail: ng@chbe.gatech.edu
OrcID: 0000-0001-8460-4765

Data Manager:

Taekyu Joo
Phone: (404) 385-2149
E-mail: tjoo6@gatech.edu


Reactant Compound type Concentration Concentration units
alpha-Pinene (6654)
  • Alkene
149.4 Microgram Per Cubic Meter
Limonene (22311)
  • Alkene
32.6 Microgram Per Cubic Meter

20220718_TimeLine.csv Timeline

Time (ET) Action
11:00 GC on
11:00 SMPS on
11:40 AMS on filter
12:00 AMS on chamber
12:00 RHT/NOx/O3 on
12:20 Seed injection starts
12:24 VOC injection starts (a-pinene)
12:35 VOC injection ends (a-pinene)
12:50 Seed injection ends
14:00 N2O5 injection starts
14:08:50 N2O5 injection ends
15:00 VOC injection starts (limonene)
15:10 VOC injection ends (limonene)
15:12 N2O5 injection starts
15:15:30 N2O5 injection ends
16:14 GC off
19:00 RHT/NOx/O3 off
19:00 SMPS off
19:00 AMS off
19:30 FIGAERO-CIMS off

Light Flux Characterizations:
Particle Loss Characterizations:
2022-06-30 (#36)
Vapor Loss Characterizations:

Chamber Details

Name: Georgia Tech Environmental Chamber (Far)
Volume in cubic meters: 12.6
Surface area in cubic meters: 32.48865
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness:
Replacement date: 2017-02-07
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on
o3 background: 3
nox background: 1
Particle background in micrograms per cubic meter:
Air filtration method: Pure air generator with membrane filter dryer
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 4
Temparature range (max degrees celcius): 40
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 2
Relative humidity range (max percent): 70
Particle experiment capability: 1
Lights: Yes
Light source type(s): UVA Black Lamps, Natural Sunlight
Supplemental information:
Additional Notes: