http://lod.bco-dmo.org/id/dataset/542153
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2014-12-09
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Results from experiment examining 15N-labeled contaminants in commercial 15N2 gas: Detected 15N-labeled nitrate (NO3) in commercial 15N2 gas (15N2 Contamination project)
2014-12-09
publication
2014-12-09
revision
BCO-DMO Linked Data URI
2014-12-09
creation
http://lod.bco-dmo.org/id/dataset/542153
Julie Granger
University of Connecticut
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Granger, J. (2014) Results from experiment examining 15N-labeled contaminants in commercial 15N2 gas: Detected 15N-labeled nitrate (NO3) in commercial 15N2 gas (15N2 Contamination project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 09 Dec 2014) Version Date 2014-12-09 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/542153 [access date]
Detected 15N-labeled nitrate (NO3) in commercial 15N2 gas. Dataset Description: <p>delta 15N NO3 measurments from experiments on 15N-labeled contaminants in commercial 15N2 gas; data used in Dabundo et al. 2014.</p>
<p>Refer to the following publication for more information:<br />
Dabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N–Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:<a href="http://dx.doi.org/10.1371/journal.pone.0110335" target="_blank">10.1371/journal.pone.0110335</a></p>
<p>See related datasets:<br />
<a href="http://www.bco-dmo.org/dataset/542884">delta 15N NH4</a><br />
<a href="http://www.bco-dmo.org/dataset/546779">direct N2O</a><br />
<a href="http://www.bco-dmo.org/dataset/549112">N2</a><br />
<a href="http://www.bco-dmo.org/dataset/547774">particulate N</a></p> Methods and Sampling: <p>Data was acquired from an isotope ratio mass spectrometer using Isodat 3.0 software.</p>
<p><strong>Nitrate Calculations:</strong> delta 15N NO3 and apparent delta 18O were calculated from uncorr_d45_44 and uncorr_d46_44 using equations outlined in the "Nitrate isotope corrections" <a href="http://dmoserv3.whoi.edu/data_docs/15N2_Contamination/Nitrate_isotope_corrections.PDF" target="_blank">supplementary file</a> (PDF), followed by reference to IAEA N-3, US34, US32, and/or UBN-1 standards.</p>
<p><strong>Refer to the following publication for more information:</strong><br />
Dabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N–Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:<a href="http://dx.doi.org/10.1371/journal.pone.0110335" target="_blank">10.1371/journal.pone.0110335</a></p>
<p><strong>Summary of methods from Dabundo et al. 2014:</strong><br />
<em>Reagents:</em><br />
Four lecture bottles of 98+ at% 15N-labeled N2 gas were purchased from Sigma-Aldrich, three from lot # SZ1670V, and one from lot # MBBB0968V. Two 1L lecture bottles of 98+ at% 15N2 were purchased from Cambridge Isotopes from lot #’s I1-11785A and I-16727. One 1L lecture bottle of 98+ at% 15N2 was purchased from Campro Scientific from lot # EB1169V. Ammonium and nitrate solutions were prepared with salts or with solutions obtained from different distributors: sodium nitrate (NaNO3), potassium nitrate (KNO3), and ammonium chloride (NH4Cl) from Fisher Scientific; analytical-grade potassium nitrate from Fluka Analytical and a gravimetric solution of ammonium chloride from SPEX CertiPrep.</p>
<p><em>Preparation of nitrate &amp; ammonium solutions:</em><br />
Aqueous solutions of natural abundance (unlabeled) ammonium and nitrate salts were equilibrated overnight with an air headspace supplemented with an injection of 15N2 gas (to determine whether the 15N2 gas stocks contained 15N-labeled ammonia (NH3) or nitrate and/or nitrite (NOx) contaminants). After equilibration, the 15N/14N ratio of ammonium and the 15N/14N and 18O/16O ratios of nitrate/nitrite in solution were measured, as well as the 15N/14N ratio of N2 gas in the headspace. The isotope ratios of nitrate and ammonium were compared to those in control solutions, which were not supplemented with 15N2 gas. Experiments with the Campro Scientific 15N2 stock were verified for 15N-nitrate/nitrite contaminants only (and not for 15N-ammonium).</p>
<p>Initial experiments consisted of 40 mL or 100 mL solutions of 10, 50, 100, 200, or 300 umol/L nitrate and 5 umol/L ammonium chloride in 60 mL or 120 mL serum vials that were sealed with stoppers. The 20 mL of air headspace in each of the treatment vials was supplemented with 0.1 mL of 15N2 gas from respective bottles from each of the three suppliers. The solutions were equilibrated overnight on a shaker, after which the 15N/14N and 18O/16O isotope ratios of nitrate were analyzed. The 15N/14N isotope ratio of ammonium was also analyzed in experimental solutions treated with the Sigma-Aldrich and Cambridge Isotopes stocks.</p>
<p>Additional experiments were carried out in which 2 mL 15N2 gas was equilibrated overnight in 20 mL serum vials containing 10 mL solutions of 10 umol/L sodium nitrate, after which the 15N/14N and 18O/16O ratios of nitrate were measured. Similarly, 10 mL solutions of 5 umol/L ammonium chloride were dispensed in 20 mL serum vials and equilibrated overnight with 2 mL 15N2 gas, after which the 15N/14N isotope ratios of ammonium were analyzed.</p>
<p><em>Nitrate and ammonium concentrations:</em><br />
Nitrate concentrations in the experimental solutions were verified via reduction to nitric oxide in hot vanadium (III) solution followed by detection with a chemiluminescence NOx analyzer (model T200 Teledyne Advanced Pollution Instrumentation). Ammonium concentrations were measured by derivatization with orthophthaldialdehyde (OPA) and fluorometric detection on an AJN Scientific f-2500 Fluorescence Spectrophotometer.</p>
<p><em>Nitrate N and O isotope ratio analyses:</em><br />
Nitrate/nitrite nitrogen (15N/14N) and oxygen (18O/16O) isotope ratios were measured using the denitrifier method. Nitrate (and nitrite) in experimental samples was converted stoichiometrically to nitrous oxide (N2O) by a denitrifying bacterial strain (Pseudomonas chlororaphis f. sp. aureofaciens, ATCC 13985) that lacks nitrous oxide reductase. The N and O isotopic composition of N2O was then measured on a Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) interfaced with a modified Gas Bench II gas chromatograph (Thermo Fisher) purge and trap system. The isotope ratio measurements are reported in per mille (o/oo) units.</p>
<p>The 15N/14N reference is N2 in air, and the 18O/16O reference is Vienna Standard Mean Ocean water (V-SMOW). Individual analyses on the GC-IRMS were referenced to injections of N2O from a pure N2O gas cylinder, and then standardized through comparison to the international nitrate standards USGS-34, USGS-32, and IAEA-NO-3, using standard bracketing techniques. Nitrate samples from experiments with Campro Scientific 15N2 were standardized with USGS-32 and IAEA-NO-3, and an additional internal lab nitrate standard (UBN-1).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1233897 Award URL: http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1233897
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1130495 Award URL: http://www.nsf.gov/awardsearch/showAward?AWD_ID=1130495
Funding provided by Swiss National Science Foundation (SNSF) Award Number: R Equip 121258
completed
Julie Granger
University of Connecticut
860-405-9094
Department of Marine Sciences 1080 Shenecossett Road
Groton
CT
06340
USA
julie.granger@uconn.edu
pointOfContact
asNeeded
Dataset Version: 09 Dec 2014
Unknown
lecture_bottle
solution
headspace
N2_injection
lot_number
sample_ID
initial_NO3
uncorr_d45_44
uncorr_d46_44
delta_15N_NO3
apparent_delta_18O
delta_18O
Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS)
Gas Chromatograph
AJN Scientific f-2500 Fluorescence Spectrophotometer
T200 Teledyne Advanced Pollution Instrumentation
theme
None, User defined
No BCO-DMO term
sample identification
dN15_NO3
oxygen 16 to oxygen 18 ratio
featureType
BCO-DMO Standard Parameters
Isotope-ratio Mass Spectrometer
Gas Chromatograph
Spectrophotometer
Chemiluminescence NOx Analyzer
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
The Ocean Nitrogen Imbalance Paradox: Environmental Controls on the Denitrification Isotope Effect
https://www.bco-dmo.org/project/528935
The Ocean Nitrogen Imbalance Paradox: Environmental Controls on the Denitrification Isotope Effect
<p><em>Description from NSF award abstract:</em><br />
This study will test the sensitivity of the amplitude of the denitrification isotope effect to culture conditions pertinent to the ocean environment. The isotope effect amplitude will be explored with respect to electron donor, trace oxygenation, and temperature, in both batch and continuous culture experiments of denitrifiers. The proposed work will also involve measurements of the enzymatic isotope effect of the respiratory nitrate reductase of denitrifiers, measurements of its enzymatic activity among cultures, and examination of cellular nitrate transport kinetics of denitrifying strains. The experiments are designed to reveal the physiological basis of the modulation of the isotope effect amplitude, which will further resolve this manifestation in the environment.</p>
<p>In regards to the broader significance and importance of this study, these new experimental data will provide a basis for integration of nitrogen isotope dynamics in ocean models to test how key environmental parameters can affect the global ocean distribution of nitrogen isotopes.</p>
15N2 Contamination
largerWorkCitation
project
eng; USA
oceans
2014-12-09
0
BCO-DMO catalogue of parameters from Results from experiment examining 15N-labeled contaminants in commercial 15N2 gas: Detected 15N-labeled nitrate (NO3) in commercial 15N2 gas (15N2 Contamination project)
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/542168.rdf
Name: lecture_bottle
Units: dimensionless
Description: Identifier of the lecture bottle of 15N-labeled N2 gas used in the experiment.
http://lod.bco-dmo.org/id/dataset-parameter/542169.rdf
Name: solution
Units: milliliters (mL)
Description: Solution volume.
http://lod.bco-dmo.org/id/dataset-parameter/542170.rdf
Name: headspace
Units: milliliters (mL)
Description: Headspace volume.
http://lod.bco-dmo.org/id/dataset-parameter/542171.rdf
Name: N2_injection
Units: milliliters (mL)
Description: Quantity of 15N-labeled N2 gas supplemented in the headspace of the experimental samples. (Control solutions were NOT supplemented with the 15N2 gas).
http://lod.bco-dmo.org/id/dataset-parameter/542172.rdf
Name: lot_number
Units: dimensionless
Description: Lot number of the 15N-labeled N2 gas; or 'Control' or 'Standard' for controls and standards respectively.
http://lod.bco-dmo.org/id/dataset-parameter/542173.rdf
Name: sample_ID
Units: dimensionless
Description: Sample identification number.
http://lod.bco-dmo.org/id/dataset-parameter/542174.rdf
Name: initial_NO3
Units: micromolar (uM)
Description: Initial concentration of nitrate (NO3).
http://lod.bco-dmo.org/id/dataset-parameter/542175.rdf
Name: uncorr_d45_44
Units: dimensionless
Description: Uncorrected d45/44 ratio.
http://lod.bco-dmo.org/id/dataset-parameter/542176.rdf
Name: uncorr_d46_44
Units: dimensionless
Description: Uncorrected d46/44 ratio.
http://lod.bco-dmo.org/id/dataset-parameter/542177.rdf
Name: delta_15N_NO3
Units: per mille (o/oo)
Description: delta 15N NO3.
http://lod.bco-dmo.org/id/dataset-parameter/542178.rdf
Name: apparent_delta_18O
Units: per mille (o/oo)
Description: Apparent delta 18O; experimental samples.
http://lod.bco-dmo.org/id/dataset-parameter/542179.rdf
Name: delta_18O
Units: per mille (o/oo)
Description: delta 18O; controls and standards.
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
15438
https://datadocs.bco-dmo.org/file/xooy0YnFJ00v3L/NO3.csv
NO3.csv
Primary data file for dataset ID 542153
download
https://www.bco-dmo.org/dataset/542153/data/download
download
onLine
dataset
<p>Data was acquired from an isotope ratio mass spectrometer using Isodat 3.0 software.</p>
<p><strong>Nitrate Calculations:</strong> delta 15N NO3 and apparent delta 18O were calculated from uncorr_d45_44 and uncorr_d46_44 using equations outlined in the "Nitrate isotope corrections" <a href="http://dmoserv3.whoi.edu/data_docs/15N2_Contamination/Nitrate_isotope_corrections.PDF" target="_blank">supplementary file</a> (PDF), followed by reference to IAEA N-3, US34, US32, and/or UBN-1 standards.</p>
<p><strong>Refer to the following publication for more information:</strong><br />
Dabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N–Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:<a href="http://dx.doi.org/10.1371/journal.pone.0110335" target="_blank">10.1371/journal.pone.0110335</a></p>
<p><strong>Summary of methods from Dabundo et al. 2014:</strong><br />
<em>Reagents:</em><br />
Four lecture bottles of 98+ at% 15N-labeled N2 gas were purchased from Sigma-Aldrich, three from lot # SZ1670V, and one from lot # MBBB0968V. Two 1L lecture bottles of 98+ at% 15N2 were purchased from Cambridge Isotopes from lot #’s I1-11785A and I-16727. One 1L lecture bottle of 98+ at% 15N2 was purchased from Campro Scientific from lot # EB1169V. Ammonium and nitrate solutions were prepared with salts or with solutions obtained from different distributors: sodium nitrate (NaNO3), potassium nitrate (KNO3), and ammonium chloride (NH4Cl) from Fisher Scientific; analytical-grade potassium nitrate from Fluka Analytical and a gravimetric solution of ammonium chloride from SPEX CertiPrep.</p>
<p><em>Preparation of nitrate &amp; ammonium solutions:</em><br />
Aqueous solutions of natural abundance (unlabeled) ammonium and nitrate salts were equilibrated overnight with an air headspace supplemented with an injection of 15N2 gas (to determine whether the 15N2 gas stocks contained 15N-labeled ammonia (NH3) or nitrate and/or nitrite (NOx) contaminants). After equilibration, the 15N/14N ratio of ammonium and the 15N/14N and 18O/16O ratios of nitrate/nitrite in solution were measured, as well as the 15N/14N ratio of N2 gas in the headspace. The isotope ratios of nitrate and ammonium were compared to those in control solutions, which were not supplemented with 15N2 gas. Experiments with the Campro Scientific 15N2 stock were verified for 15N-nitrate/nitrite contaminants only (and not for 15N-ammonium).</p>
<p>Initial experiments consisted of 40 mL or 100 mL solutions of 10, 50, 100, 200, or 300 umol/L nitrate and 5 umol/L ammonium chloride in 60 mL or 120 mL serum vials that were sealed with stoppers. The 20 mL of air headspace in each of the treatment vials was supplemented with 0.1 mL of 15N2 gas from respective bottles from each of the three suppliers. The solutions were equilibrated overnight on a shaker, after which the 15N/14N and 18O/16O isotope ratios of nitrate were analyzed. The 15N/14N isotope ratio of ammonium was also analyzed in experimental solutions treated with the Sigma-Aldrich and Cambridge Isotopes stocks.</p>
<p>Additional experiments were carried out in which 2 mL 15N2 gas was equilibrated overnight in 20 mL serum vials containing 10 mL solutions of 10 umol/L sodium nitrate, after which the 15N/14N and 18O/16O ratios of nitrate were measured. Similarly, 10 mL solutions of 5 umol/L ammonium chloride were dispensed in 20 mL serum vials and equilibrated overnight with 2 mL 15N2 gas, after which the 15N/14N isotope ratios of ammonium were analyzed.</p>
<p><em>Nitrate and ammonium concentrations:</em><br />
Nitrate concentrations in the experimental solutions were verified via reduction to nitric oxide in hot vanadium (III) solution followed by detection with a chemiluminescence NOx analyzer (model T200 Teledyne Advanced Pollution Instrumentation). Ammonium concentrations were measured by derivatization with orthophthaldialdehyde (OPA) and fluorometric detection on an AJN Scientific f-2500 Fluorescence Spectrophotometer.</p>
<p><em>Nitrate N and O isotope ratio analyses:</em><br />
Nitrate/nitrite nitrogen (15N/14N) and oxygen (18O/16O) isotope ratios were measured using the denitrifier method. Nitrate (and nitrite) in experimental samples was converted stoichiometrically to nitrous oxide (N2O) by a denitrifying bacterial strain (Pseudomonas chlororaphis f. sp. aureofaciens, ATCC 13985) that lacks nitrous oxide reductase. The N and O isotopic composition of N2O was then measured on a Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) interfaced with a modified Gas Bench II gas chromatograph (Thermo Fisher) purge and trap system. The isotope ratio measurements are reported in per mille (o/oo) units.</p>
<p>The 15N/14N reference is N2 in air, and the 18O/16O reference is Vienna Standard Mean Ocean water (V-SMOW). Individual analyses on the GC-IRMS were referenced to injections of N2O from a pure N2O gas cylinder, and then standardized through comparison to the international nitrate standards USGS-34, USGS-32, and IAEA-NO-3, using standard bracketing techniques. Nitrate samples from experiments with Campro Scientific 15N2 were standardized with USGS-32 and IAEA-NO-3, and an additional internal lab nitrate standard (UBN-1).</p>
Specified by the Principal Investigator(s)
<p>Since 46/44 enrichment is a function of 15N15N16O contamination rather than delta 18O enrichment of nitrate, as the delta 15N correction scheme presumes, uncorr delta 46/44 was replaced with the average control delta 46/44 value to calculate delta 15N in some experiments (Sigma A3, Sigma B (40 mL and 10 mL solutions), Cambridge B (10 mL solution), Campro Scientific). In experiments where 46/44 was small relative 45/44, this was not necessary.</p>
<p>Samples with the same ID are replicated measurements.</p>
<p>BCO-DMO Edits:<br />
- Modified parameter names to conform with BCO-DMO naming conventions;<br />
- Denoted 'Control' and 'Standard' in the lot_number column;<br />
- Replaced spaces with underscores.</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS)
Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS)
PI Supplied Instrument Name: Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) PI Supplied Instrument Description:The N and O isotopic composition of N2O was then measured on a Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) interfaced with a modified Gas Bench II gas chromatograph (Thermo Fisher) purge and trap system.
Data was acquired from an isotope ratio mass spectrometer using Isodat 3.0 software. Instrument Name: Isotope-ratio Mass Spectrometer Instrument Short Name:IR Mass Spec; IRMS Instrument Description: The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
Gas Chromatograph
Gas Chromatograph
PI Supplied Instrument Name: Gas Chromatograph PI Supplied Instrument Description:The N and O isotopic composition of N2O was then measured on a Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) interfaced with a modified Gas Bench II gas chromatograph (Thermo Fisher) purge and trap system. Instrument Name: Gas Chromatograph Instrument Short Name:Gas Chromatograph Instrument Description: Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC) Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/
AJN Scientific f-2500 Fluorescence Spectrophotometer
AJN Scientific f-2500 Fluorescence Spectrophotometer
PI Supplied Instrument Name: AJN Scientific f-2500 Fluorescence Spectrophotometer PI Supplied Instrument Description:Ammonium concentrations were measured by derivatization with orthophthaldialdehyde (OPA) and fluorometric detection on an AJN Scientific f-2500 Fluorescence Spectrophotometer. Instrument Name: Spectrophotometer Instrument Short Name:Spectrophotometer Instrument Description: An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/
T200 Teledyne Advanced Pollution Instrumentation
T200 Teledyne Advanced Pollution Instrumentation
PI Supplied Instrument Name: T200 Teledyne Advanced Pollution Instrumentation PI Supplied Instrument Description:Nitrate concentrations in the experimental solutions were verified via reduction to nitric oxide in hot vanadium (III) solution followed by detection with a chemiluminescence NOx analyzer (model T200 Teledyne Advanced Pollution Instrumentation). Instrument Name: Chemiluminescence NOx Analyzer Instrument Short Name: Instrument Description: The chemiluminescence method for gas analysis of oxides of nitrogen relies on the measurement of light produced by the gas-phase titration of nitric oxide and ozone. A chemiluminescence analyzer can measure the concentration of NO/NO2/NOX.
One example is the Teledyne Model T200: https://www.teledyne-api.com/products/nitrogen-compound-instruments/t200