Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy
The effect of background gas composition on the measurement of CO<sub>2</sub> levels was investigated by wavelength-scanned cavity ring-down spectrometry (WS-CRDS) employing a spectral line centered at the <i>R</i>(1) of the (3 0<sup>0</sup> 1)<sub>III<...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-12-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/10/4613/2017/amt-10-4613-2017.pdf |
| _version_ | 1819200310074146816 |
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| author | J. S. Lim M. Park J. Lee J. Lee |
| author_facet | J. S. Lim M. Park J. Lee J. Lee |
| author_sort | J. S. Lim |
| collection | DOAJ |
| description | The effect of background gas composition on the measurement
of CO<sub>2</sub> levels was investigated by wavelength-scanned cavity ring-down
spectrometry (WS-CRDS) employing a spectral line centered at the <i>R</i>(1) of the
(3 0<sup>0</sup> 1)<sub>III</sub> ← (0 0 0) band. For this purpose, eight
cylinders with various gas compositions were gravimetrically and
volumetrically prepared within 2<i>σ</i> = 0.1 %, and these gas
mixtures were introduced into the WS-CRDS analyzer calibrated against
standards of ambient air composition. Depending on the gas composition,
deviations between CRDS-determined and gravimetrically (or volumetrically)
assigned CO<sub>2</sub> concentrations ranged from −9.77 to 5.36 µmol mol<sup>−1</sup>,
e.g., excess N<sub>2</sub> exhibited a negative deviation, whereas excess Ar
showed a positive one. The total pressure broadening coefficients (TPBCs)
obtained from the composition of N<sub>2</sub>, O<sub>2</sub>, and Ar thoroughly
corrected the deviations up to −0.5 to 0.6 µmol mol<sup>−1</sup>, while these values
were −0.43 to 1.43 µmol mol<sup>−1</sup> considering PBCs induced by only N<sub>2</sub>. The
use of TPBC enhanced deviations to be corrected to ∼ 0.15 %.<br><br>
Furthermore, the above correction linearly shifted CRDS responses for a large
extent of TPBCs ranging from 0.065 to 0.081 cm<sup>−1</sup> atm<sup>−1</sup>. Thus,
accurate measurements using optical intensity-based techniques such as
WS-CRDS require TPBC-based instrument calibration or use standards prepared
in the same background composition of ambient air. |
| first_indexed | 2024-12-23T03:30:12Z |
| format | Article |
| id | doaj.art-c28a72c447f64c0e9242014b3949e59a |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-23T03:30:12Z |
| publishDate | 2017-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-c28a72c447f64c0e9242014b3949e59a2022-12-21T18:01:44ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482017-12-01104613462110.5194/amt-10-4613-2017Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopyJ. S. Lim0M. Park1J. Lee2J. Lee3Center for Gas Analysis, Chemical and Medical Metrology Division, Korea Research Institute of Standards and Science (KRISS), Gajeong-ro 267, Yuseong-gu, Daejeon 34113, Republic of KoreaCenter for Gas Analysis, Chemical and Medical Metrology Division, Korea Research Institute of Standards and Science (KRISS), Gajeong-ro 267, Yuseong-gu, Daejeon 34113, Republic of KoreaCenter for Gas Analysis, Chemical and Medical Metrology Division, Korea Research Institute of Standards and Science (KRISS), Gajeong-ro 267, Yuseong-gu, Daejeon 34113, Republic of KoreaCenter for Gas Analysis, Chemical and Medical Metrology Division, Korea Research Institute of Standards and Science (KRISS), Gajeong-ro 267, Yuseong-gu, Daejeon 34113, Republic of KoreaThe effect of background gas composition on the measurement of CO<sub>2</sub> levels was investigated by wavelength-scanned cavity ring-down spectrometry (WS-CRDS) employing a spectral line centered at the <i>R</i>(1) of the (3 0<sup>0</sup> 1)<sub>III</sub> ← (0 0 0) band. For this purpose, eight cylinders with various gas compositions were gravimetrically and volumetrically prepared within 2<i>σ</i> = 0.1 %, and these gas mixtures were introduced into the WS-CRDS analyzer calibrated against standards of ambient air composition. Depending on the gas composition, deviations between CRDS-determined and gravimetrically (or volumetrically) assigned CO<sub>2</sub> concentrations ranged from −9.77 to 5.36 µmol mol<sup>−1</sup>, e.g., excess N<sub>2</sub> exhibited a negative deviation, whereas excess Ar showed a positive one. The total pressure broadening coefficients (TPBCs) obtained from the composition of N<sub>2</sub>, O<sub>2</sub>, and Ar thoroughly corrected the deviations up to −0.5 to 0.6 µmol mol<sup>−1</sup>, while these values were −0.43 to 1.43 µmol mol<sup>−1</sup> considering PBCs induced by only N<sub>2</sub>. The use of TPBC enhanced deviations to be corrected to ∼ 0.15 %.<br><br> Furthermore, the above correction linearly shifted CRDS responses for a large extent of TPBCs ranging from 0.065 to 0.081 cm<sup>−1</sup> atm<sup>−1</sup>. Thus, accurate measurements using optical intensity-based techniques such as WS-CRDS require TPBC-based instrument calibration or use standards prepared in the same background composition of ambient air.https://www.atmos-meas-tech.net/10/4613/2017/amt-10-4613-2017.pdf |
| spellingShingle | J. S. Lim M. Park J. Lee J. Lee Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy Atmospheric Measurement Techniques |
| title | Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy |
| title_full | Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy |
| title_fullStr | Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy |
| title_full_unstemmed | Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy |
| title_short | Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy |
| title_sort | validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures impact of background gas composition on co sub 2 sub quantitation by cavity ring down spectroscopy |
| url | https://www.atmos-meas-tech.net/10/4613/2017/amt-10-4613-2017.pdf |
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