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Ion-pair hollow-fiber liquid-phase microextraction of the quaternary ammonium surfactant dicocodimethylammonium chloride

Hultgren, Sofie; Larsson, Niklas LU ; Nilsson, Bo F. and Jönsson, Jan Åke LU (2009) In Analytical and Bioanalytical Chemistry 393(3). p.929-937
Abstract
A two-phase hollow-fiber (HF) liquid-phase microextraction (LPME) method was developed for determination of a quaternary ammonium compound surfactant, dicocodimethylammonium chloride, in aqueous samples. The porous HF was fixed on a metal rod support and was impregnated with approximately 6.6 mu L of organic extractant, which was immobilized in the HF pores. Surfactant extraction was facilitated by addition of carboxylic acid to the sample forming neutral ion pairs with the quaternary ammonium compound. After extraction, the analyte was transferred from the organic extractant in the fiber pores by dissolving the 1-octanol into 100 mu L methanol. The methanol extract was analyzed by liquid chromatography-mass spectrometry. The method was... (More)
A two-phase hollow-fiber (HF) liquid-phase microextraction (LPME) method was developed for determination of a quaternary ammonium compound surfactant, dicocodimethylammonium chloride, in aqueous samples. The porous HF was fixed on a metal rod support and was impregnated with approximately 6.6 mu L of organic extractant, which was immobilized in the HF pores. Surfactant extraction was facilitated by addition of carboxylic acid to the sample forming neutral ion pairs with the quaternary ammonium compound. After extraction, the analyte was transferred from the organic extractant in the fiber pores by dissolving the 1-octanol into 100 mu L methanol. The methanol extract was analyzed by liquid chromatography-mass spectrometry. The method was optimized (with optimized parameters in brackets) with regard to type of organic extractant (1-octanol), fiber length (2 cm), choice and concentration of anionic carrier (600 mu g L-1 octanoate), procedure of transfer to methanol (15-min sonication), sample volume (250 mL), extraction time (17 h), pH (10), and ionic strength (50 mM carbonate). Aspects influencing repeatability in LPME of (quaternary ammonium) surfactants are discussed. The enrichment factor achieved in 250-mL carbonate buffer was around 400. Due to matrix effects, the enrichment factors achieved when industrial process water was analyzed were 120 or about 30% of that in carbonate buffer. Detection limits of 0.3 mu g L-1 in carbonate buffer and 0.9 mu g L-1 in industrial process water were obtained. If the studied compound is seen as a model substance representing quaternary dialkylated dimethylated ammonium surfactants in general, the developed method may be applied to other quaternary ammonium surfactants. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
spectrometry, Mass, Liquid chromatography, Ion-pair extraction, surfactant, Cationic, Liquid-phase microextraction, Quaternary ammonium compound
in
Analytical and Bioanalytical Chemistry
volume
393
issue
3
pages
929 - 937
publisher
Springer
external identifiers
  • wos:000262825300013
  • scopus:59249086202
ISSN
1618-2642
DOI
10.1007/s00216-008-2524-8
language
English
LU publication?
yes
id
7a38ddb8-217d-4673-86ac-4e18154b2d28 (old id 1311606)
date added to LUP
2009-03-16 16:00:09
date last changed
2017-07-02 03:37:34
@article{7a38ddb8-217d-4673-86ac-4e18154b2d28,
  abstract     = {A two-phase hollow-fiber (HF) liquid-phase microextraction (LPME) method was developed for determination of a quaternary ammonium compound surfactant, dicocodimethylammonium chloride, in aqueous samples. The porous HF was fixed on a metal rod support and was impregnated with approximately 6.6 mu L of organic extractant, which was immobilized in the HF pores. Surfactant extraction was facilitated by addition of carboxylic acid to the sample forming neutral ion pairs with the quaternary ammonium compound. After extraction, the analyte was transferred from the organic extractant in the fiber pores by dissolving the 1-octanol into 100 mu L methanol. The methanol extract was analyzed by liquid chromatography-mass spectrometry. The method was optimized (with optimized parameters in brackets) with regard to type of organic extractant (1-octanol), fiber length (2 cm), choice and concentration of anionic carrier (600 mu g L-1 octanoate), procedure of transfer to methanol (15-min sonication), sample volume (250 mL), extraction time (17 h), pH (10), and ionic strength (50 mM carbonate). Aspects influencing repeatability in LPME of (quaternary ammonium) surfactants are discussed. The enrichment factor achieved in 250-mL carbonate buffer was around 400. Due to matrix effects, the enrichment factors achieved when industrial process water was analyzed were 120 or about 30% of that in carbonate buffer. Detection limits of 0.3 mu g L-1 in carbonate buffer and 0.9 mu g L-1 in industrial process water were obtained. If the studied compound is seen as a model substance representing quaternary dialkylated dimethylated ammonium surfactants in general, the developed method may be applied to other quaternary ammonium surfactants.},
  author       = {Hultgren, Sofie and Larsson, Niklas and Nilsson, Bo F. and Jönsson, Jan Åke},
  issn         = {1618-2642},
  keyword      = {spectrometry,Mass,Liquid chromatography,Ion-pair extraction,surfactant,Cationic,Liquid-phase microextraction,Quaternary ammonium compound},
  language     = {eng},
  number       = {3},
  pages        = {929--937},
  publisher    = {Springer},
  series       = {Analytical and Bioanalytical Chemistry},
  title        = {Ion-pair hollow-fiber liquid-phase microextraction of the quaternary ammonium surfactant dicocodimethylammonium chloride},
  url          = {http://dx.doi.org/10.1007/s00216-008-2524-8},
  volume       = {393},
  year         = {2009},
}