Spectrally Resolved UV Absorption Cross-Sections of Alkali Hydroxides and Chlorides Measured in Hot Flue Gases
(2018) In Applied Spectroscopy 72(9). p.1388-1395- Abstract
Spectrally resolved ultraviolet (UV) absorption cross-sections of gas-phase sodium chloride (NaCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH) were measured, for the first time, in hot flue gases at different temperatures. Homogenous gas-phase NaCl, KCl (potassium chloride), NaOH, and KOH at temperatures 1200 K, 1400 K, 1600 K, and 1850 K were prepared in the post-flame zone of laminar flames by seeding nebulized droplets out of aqueous solution of corresponding alkali species. The amount of droplets seeded into the flame was kept constant, so the relative concentration of different alkali species can be derived. The broadband UV absorption cross-section of KCl vapor reported by Leffler et al. was adopted to derive the... (More)
Spectrally resolved ultraviolet (UV) absorption cross-sections of gas-phase sodium chloride (NaCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH) were measured, for the first time, in hot flue gases at different temperatures. Homogenous gas-phase NaCl, KCl (potassium chloride), NaOH, and KOH at temperatures 1200 K, 1400 K, 1600 K, and 1850 K were prepared in the post-flame zone of laminar flames by seeding nebulized droplets out of aqueous solution of corresponding alkali species. The amount of droplets seeded into the flame was kept constant, so the relative concentration of different alkali species can be derived. The broadband UV absorption cross-section of KCl vapor reported by Leffler et al. was adopted to derive the absorption cross-section curves of NaCl, NaOH, and KOH with the corresponding measured spectrally resolved absorbance spectra. No significant changes in the spectral structures in the absorption cross-sections were found as the temperature varied between 1200 K and 1850 K, except for NaOH at around 320 nm. The difference between the absorption spectral curves of alkali chlorides and hydroxides is significant at wavelengths above 300 nm, which thus can be used to distinguish and obtain the concentrations of alkali chlorides and hydroxides in the broadband UV absorption measurements.
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- author
- Weng, Wubin LU ; Leffler, Tomas LU ; Brackmann, Christian LU ; Aldén, Marcus LU and Li, Zhongshan LU
- organization
- publishing date
- 2018-01-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- absorption cross-section, Alkali chlorides, alkali hydroxides, laminar flame, UV absorption spectroscopy
- in
- Applied Spectroscopy
- volume
- 72
- issue
- 9
- pages
- 1388 - 1395
- publisher
- Society for Applied Spectroscopy
- external identifiers
-
- pmid:29589783
- scopus:85045072583
- ISSN
- 0003-7028
- DOI
- 10.1177/0003702818763819
- language
- English
- LU publication?
- yes
- id
- 98de1ad7-bc51-4aed-aaf2-326a2f555e5a
- date added to LUP
- 2018-04-23 13:59:27
- date last changed
- 2024-05-27 10:42:48
@article{98de1ad7-bc51-4aed-aaf2-326a2f555e5a,
abstract = {{<p>Spectrally resolved ultraviolet (UV) absorption cross-sections of gas-phase sodium chloride (NaCl), potassium hydroxide (KOH), and sodium hydroxide (NaOH) were measured, for the first time, in hot flue gases at different temperatures. Homogenous gas-phase NaCl, KCl (potassium chloride), NaOH, and KOH at temperatures 1200 K, 1400 K, 1600 K, and 1850 K were prepared in the post-flame zone of laminar flames by seeding nebulized droplets out of aqueous solution of corresponding alkali species. The amount of droplets seeded into the flame was kept constant, so the relative concentration of different alkali species can be derived. The broadband UV absorption cross-section of KCl vapor reported by Leffler et al. was adopted to derive the absorption cross-section curves of NaCl, NaOH, and KOH with the corresponding measured spectrally resolved absorbance spectra. No significant changes in the spectral structures in the absorption cross-sections were found as the temperature varied between 1200 K and 1850 K, except for NaOH at around 320 nm. The difference between the absorption spectral curves of alkali chlorides and hydroxides is significant at wavelengths above 300 nm, which thus can be used to distinguish and obtain the concentrations of alkali chlorides and hydroxides in the broadband UV absorption measurements.</p>}},
author = {{Weng, Wubin and Leffler, Tomas and Brackmann, Christian and Aldén, Marcus and Li, Zhongshan}},
issn = {{0003-7028}},
keywords = {{absorption cross-section; Alkali chlorides; alkali hydroxides; laminar flame; UV absorption spectroscopy}},
language = {{eng}},
month = {{01}},
number = {{9}},
pages = {{1388--1395}},
publisher = {{Society for Applied Spectroscopy}},
series = {{Applied Spectroscopy}},
title = {{Spectrally Resolved UV Absorption Cross-Sections of Alkali Hydroxides and Chlorides Measured in Hot Flue Gases}},
url = {{https://lup.lub.lu.se/search/files/51832292/paper4_Li.pdf}},
doi = {{10.1177/0003702818763819}},
volume = {{72}},
year = {{2018}},
}