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Spectrally Resolved UV Absorption Cross-Sections of Alkali Hydroxides and Chlorides Measured in Hot Flue Gases

Weng, Wubin LU ; Leffler, Tomas LU ; Brackmann, Christian LU ; Aldén, Marcus LU and Li, Zhongshan LU (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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organization
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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
  • 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
2019-01-14 14:01:34
@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},
  keyword      = {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          = {http://dx.doi.org/10.1177/0003702818763819},
  volume       = {72},
  year         = {2018},
}