Experiment: Hildebrandt Ruiz Lab_20170704_ISOPRENE_Chlorine radical_Ammonium sulfate + Sulfuric acid_C6_continuous Cl injection_acidic seed

Experiment

Name: Hildebrandt Ruiz Lab_20170704_ISOPRENE_Chlorine radical_Ammonium sulfate + Sulfuric acid_C6_continuous Cl injection_acidic seed
Date: 2017-07-04

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 0.54, and using acidic seed. Cl was continuously injected for the lights-on period, until a total conc. of 180 ppb was reached.

Summary
Acidic seed was injected with an initial seed surface area of 2400 um2/cm3, followed by a continuous 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%.

Experiment Details

Categories:

  • Gas phase chemical reaction
  • Volatility and partitioning
  • Aerosol formation
Temperature: 25
Relative Humidity: 0
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate + Sulfuric acid
Initial Seed Concentration Value: 2400
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0
Reaction type:
Oxidant Name: Chlorine radical
Initial Oxidant Concentration Value: 180 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure:

Data Sets

ID Instrument File  
1043 CAPS NO2 monitor C6_2017_07_04_CAPSNO2.csv
1044 Labview C6_2017_07_04_Labview.csv

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

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

Download

Download this Experiment (94.05 KB)

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) 98 Parts Per Billion

C6_timeline.csv Timeline

Time (HH:MM) Event description
9:41 FIGAERO Blank
9:46 Starting FIGAERO Blank routine
9:53 Adjusting IMR pressure
10:26 Injecting 4 ul isoprene w/ 2 LPM clean air
10:49 Looking at chamber
10:58 Waiting for reagent signal to plateau before starting photooxidation
11:14 Disconnected chamber line to room; flushing zero air through chamber sampling line; CIMS open to room
11:15 Rconnected to chamber
11:22 UV on (5/5)
11:23 Start Cl2 injection 0.1 LPM w/ 0.9 LPM assist
14:18 Cl2 Injection stopped
15:19 UV off (0/5)
16:16 Prepare to set up FIGAERO filter collection
16:21 FIGAERO Collection Starts
17:06 FIlter collection stopped
17:09 FIGAERO; looking at a collected filter
17:13 Starting desorption routine

Citations
Cite this experiment: Publication associated with this experiment:

Characterizations
Light Flux 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: