A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases

A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases

<p>A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) was developed to measure <span class="inline-formula">NO<sub>2</sub></span>, peroxy nitrates (PNs), alkyl nitrates (ANs), and <span class="inline-formula">HNO<sub>3</sub...

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Main Authors: N. I. Keehan, B. Brownwood, A. Marsavin, D. A. Day, J. L. Fry
Format: Article
Language:English
Published: Copernicus Publications 2020-11-01
Series:Atmospheric Measurement Techniques
Online Access:https://amt.copernicus.org/articles/13/6255/2020/amt-13-6255-2020.pdf
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spelling doaj-61a007450f824c269d90878ed72a76ad2020-11-25T04:11:07ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482020-11-01136255626910.5194/amt-13-6255-2020A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phasesN. I. Keehan0B. Brownwood1A. Marsavin2D. A. Day3J. L. Fry4Chemistry Department and Environmental Studies Program, Reed College, Portland, OR 97205, USAChemistry Department and Environmental Studies Program, Reed College, Portland, OR 97205, USAChemistry Department and Environmental Studies Program, Reed College, Portland, OR 97205, USACooperative Institute for Research in Environmental Sciences (CIRES) and Department of Chemistry, University of Colorado, Boulder, CO 80303, USAChemistry Department and Environmental Studies Program, Reed College, Portland, OR 97205, USA<p>A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) was developed to measure <span class="inline-formula">NO<sub>2</sub></span>, peroxy nitrates (PNs), alkyl nitrates (ANs), and <span class="inline-formula">HNO<sub>3</sub></span> in the gas and particle phase, built using a commercial Los Gatos Research <span class="inline-formula">NO<sub>2</sub></span> analyzer. The detection limit of the TD-CRDS is 0.66&thinsp;ppb for ANs, PNs, and <span class="inline-formula">HNO<sub>3</sub></span> and 0.48&thinsp;ppb for <span class="inline-formula">NO<sub>2</sub></span>. For all four classes of <span class="inline-formula">NO<sub><i>y</i></sub></span>, the time resolution for separate gas and particle measurements is 8&thinsp;min, and for total gas <span class="inline-formula">+</span> particle measurements it is 3&thinsp;min. The accuracy of the TD-CRDS was tested by comparison of <span class="inline-formula">NO<sub>2</sub></span> measurements with a chemiluminescent <span class="inline-formula">NO<sub><i>x</i></sub></span> monitor and aerosol-phase ANs with an aerosol mass spectrometer (AMS). <span class="inline-formula">N<sub>2</sub>O<sub>5</sub></span> causes significant interference in the PN and AN channel under high oxidant concentration chamber conditions, and ozone pyrolysis causes a negative interference in the <span class="inline-formula">HNO<sub>3</sub></span> channel. Both interferences can be quantified and corrected for but must be considered when using TD techniques for measurements of organic nitrates. This instrument has been successfully deployed for chamber measurements at widely varying concentrations, as well as ambient measurements of <span class="inline-formula">NO<sub><i>y</i></sub></span>.</p>https://amt.copernicus.org/articles/13/6255/2020/amt-13-6255-2020.pdf
collection DOAJ
language English
format Article
sources DOAJ
author N. I. Keehan
B. Brownwood
A. Marsavin
D. A. Day
J. L. Fry
spellingShingle N. I. Keehan
B. Brownwood
A. Marsavin
D. A. Day
J. L. Fry
A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
Atmospheric Measurement Techniques
author_facet N. I. Keehan
B. Brownwood
A. Marsavin
D. A. Day
J. L. Fry
author_sort N. I. Keehan
title A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
title_short A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
title_full A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
title_fullStr A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
title_full_unstemmed A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) for the detection of organic nitrates in gas and particle phases
title_sort thermal-dissociation–cavity ring-down spectrometer (td-crds) for the detection of organic nitrates in gas and particle phases
publisher Copernicus Publications
series Atmospheric Measurement Techniques
issn 1867-1381
1867-8548
publishDate 2020-11-01
description <p>A thermal-dissociation–cavity ring-down spectrometer (TD-CRDS) was developed to measure <span class="inline-formula">NO<sub>2</sub></span>, peroxy nitrates (PNs), alkyl nitrates (ANs), and <span class="inline-formula">HNO<sub>3</sub></span> in the gas and particle phase, built using a commercial Los Gatos Research <span class="inline-formula">NO<sub>2</sub></span> analyzer. The detection limit of the TD-CRDS is 0.66&thinsp;ppb for ANs, PNs, and <span class="inline-formula">HNO<sub>3</sub></span> and 0.48&thinsp;ppb for <span class="inline-formula">NO<sub>2</sub></span>. For all four classes of <span class="inline-formula">NO<sub><i>y</i></sub></span>, the time resolution for separate gas and particle measurements is 8&thinsp;min, and for total gas <span class="inline-formula">+</span> particle measurements it is 3&thinsp;min. The accuracy of the TD-CRDS was tested by comparison of <span class="inline-formula">NO<sub>2</sub></span> measurements with a chemiluminescent <span class="inline-formula">NO<sub><i>x</i></sub></span> monitor and aerosol-phase ANs with an aerosol mass spectrometer (AMS). <span class="inline-formula">N<sub>2</sub>O<sub>5</sub></span> causes significant interference in the PN and AN channel under high oxidant concentration chamber conditions, and ozone pyrolysis causes a negative interference in the <span class="inline-formula">HNO<sub>3</sub></span> channel. Both interferences can be quantified and corrected for but must be considered when using TD techniques for measurements of organic nitrates. This instrument has been successfully deployed for chamber measurements at widely varying concentrations, as well as ambient measurements of <span class="inline-formula">NO<sub><i>y</i></sub></span>.</p>
url https://amt.copernicus.org/articles/13/6255/2020/amt-13-6255-2020.pdf
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