Experiment: 2014 FIXCIT Study_20140102_ISOPRENE/hydrogen peroxide_Hydroxyl radical_No Seed_Isoprene + OH, low NO, dry, no seeds

Experiment

Name: 2014 FIXCIT Study_20140102_ISOPRENE/hydrogen peroxide_Hydroxyl radical_No Seed_Isoprene + OH, low NO, dry, no seeds
Date: 2014-01-02

Organization
2014 FIXCIT Study

Chamber
Seinfeld chambers

Experiment Set
FIXCIT experiments

Goals
Low NO isoprene oxidation experiment to test the waters. Interested mainly in: -do instruments see the usual chemical compounds (ISOPOOH, IEPOX) -are instruments affected by ppm H2O2 levels -working out potential pitfalls in chamber method with this many instruments

Summary
Resolved initial issues with sampling lines and injection lines. Initial H2O2 addition may have been lower due to an eventually fixed issue with a lower injection line pressure. Isoprene injection proceeded as normally, but we started sampling before the prescribed 30 minutes of mixing for hydrocarbon (out of eagerness?). For future runs, it is probably advantageous to add hydrocarbon/standard first, then add H2O2. After approximately 30-45 minutes of sampling, instruments reported stable backgrounds so the full bank of UV lights were turned on. Based on initial reports, the chemistry proceeded as expected. Approximate calculation of RO2 reaction with NO vs. HO2 yielded a 1:14 ratio in the initial (~10min) phase of the experiment, which is very good. Peak ISOPOOH was reached at ~1.5-2hrs into the experiment. Bag volume was checked at 23:17.

Additional Notes
Instrument Status: TD LIF - up PTRMS - still down [waiting on a part] GTHOS - up LIF OHR - up, but OHR too high to measure. Was sampling for 1.5 h at the beginning. Will be down for tomorrow. CRM OHR - down [waiting on control board] NO CL - up GLY LIP - down [laser broken] FOR LIF - down I/A CIMS - up NCIMS - up RHTO3 - up GC FID - up AMS - up TQC1 - up TQC2 - up TOFCIMS - up Bag Additions: Isoprene, ~50ppb (5uL ISOP, 98% purity) H2O2, ~2ppm (110 uL 50% H2O2) Timeline (UTC, hrs): 16:48 - started H2O2 injection 17:44 - stopped H2O2 injection 18:02 - started ISOP injection 18:06 - instruments started sampling from the bag 18:12 - instruments were all confirmed to be sampling from the bag 18:20 - stopped ISOP injection. All flows into bag stopped. 18:57 - turned on all UV lights (config 1,2,3,4,5,6) 18:58 - CIT-TQC2 estimated H2O2 ~1ppm 18:58 - CIT-FID estimated isoprene ~45ppb 23:14 - turned off all UV lights 23:50 - all sampling ended. Added air into bag to dilute and flush.

Experiment Details

Categories:

  • Gas phase chemical reaction
Temperature: 27
Relative Humidity: 5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
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  
1050 TOF-AMS (Low Resolution) 20140102_AMS.csv
1051 GTHOS_OH 20140102_OH.csv
1052 GC-FID FIX-CIT-GCFID-VOCs_Chamber_20140102_RA.csv
1053 RHTO3NOx FIX-CIT-RHTO3NOx_Chamber_20140102_RA.csv
1054 TD-LIF D20140102_TDLIF.csv
1055 CF3O TripleQ-CIMS 20140102_TRIPCIMSmerge.csv
1056 OHR-LIF 20140102_LIFOHR.csv
1057 NO3-TOF-CIMS 20140102_NO3CIMS.csv
1090 I-TOF-CIMS 20140102_ICIMS.csv
1091 CF3O-TOF-CIMS 20140102_TOFCIMSmerge.csv

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

Experiment Set Details

Name: FIXCIT experiments
Time format and units: Seconds past midnight
Description:
The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative study at the atmospheric chambers of Caltech during January 2014. FIXCIT is the laboratory component of SOAS, and is aimed toward (1) better understanding the chemical details behind ambient observations relevant to the southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. A series of chamber experiments was conducted to investigate the oxidation of isoprene, α-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX). Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized, enabling study of the oxidation mechanisms and instrument responses for these compounds.

Collaborators:

  • Allen H. Goldstein UC Berkeley
  • William H. Brune Penn State University
  • Ronald C. Cohen UC Berkeley
  • Delphine K. Farmer Colorado State University
  • Manjula R. Canagaratna Aerodyne
  • Douglas R. Worsnop Aerodyne
  • Jose L. Jimenez University of Colorado Boulder
  • Frank N. Keutsch Harvard
  • Saewung Kim UC Irvine
  • Alex B. Guenther UC Irvine
  • John E. Mak SUNY Stonybrook
  • Geoffrey S. Tyndall NCAR
  • Denise D. Montzka NCAR
  • Andrew J. Weinheimer NCAR
  • Alam Hasson Fresno State

Download

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Contacts

Principal investigators:

Paul O. Wennberg
Phone: 626 395 2447
E-mail: wennberg@caltech.edu
OrcID: 0000-0002-6126-3854

John H. Seinfeld
Phone: 626-395-4635
E-mail: seinfeld@caltech.edu
OrcID: 0000-0003-1344-4068

John D. Crounse
Phone: 626-395-8655
E-mail: crounjd@caltech.edu
OrcID: 0000-0001-5443-729X

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

Data Manager:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu

Reactants

Reactant Compound type Concentration Concentration units
ISOPRENE (6557)
  • Alkene
 45 Parts Per Billion
hydrogen peroxide (784) 2 Parts Per Million

20140102_expTimeline.csv Timeline

UTC_hr Action
16:48 started H2O2 injection
17:44 stopped H2O2 injection
18:02 started ISOP injection
18:06 instruments started sampling from the bag
18:12 instruments were all confirmed to be sampling from the bag
18:20 stopped ISOP injection. All flows into bag stopped.
18:57 turned on all UV lights (config 1;2;3;4;5;6)
18:58 CIT-TQC2 estimated H2O2 ~1ppm
18:58 CIT-FID estimated isoprene ~45ppb
23:14 turned off all UV lights
23:50 all sampling ended. Added air into bag to dilute and flush.

Citations
Cite this experiment: Publications associated with this experiment:

Characterizations
Light Flux Characterizations:
2013-12-16 (#17)
Particle Loss Characterizations:
2013-03-07 (#13)
Vapor Loss Characterizations:
(None)

Chamber Details

Name: Seinfeld chambers
Volume in cubic meters: 22
Shape: Rectangular Prism
Surface area in cubic meters: 48
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: 40 ppt
Particle background in micrograms per cubic meter: < 0.01 ug/m3
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): 10
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 4
Relative humidity range (max percent): 90
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV black lamps (350 nm centered)
Supplemental information: https://www.worldscientific.com/doi/abs/10.1142/9789813147355_0001
Additional Notes: