Analysis of linear alkylbenzenesulfonates by capillary zone electrophoresis with large-volume sample stacking

Wang Hsien Ding, Chi Hung Liu

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39 Scopus citations

Abstract

A systematic investigation of optimal conditions for determining the homologues of linear alkylbenzenesulfonates (LAS) by capillary zone electrophoresis (CZE) using the large-volume sample stacking technique was presented. The most effective sample stacking and separation conditions was 20 mM borate buffer with 30% acetonitrile at pH 9.0, and the sample hydrodynamic injection of up to 90 s at 4 p.s.i. (1 p.s.i.=6892.86 Pa) (around 711 nl). Under such conditions, approximately a 100-fold enrichment factor was achieved based on peak heights. The reproducibility of migration time and quantitative results of stacking CZE can be improved by using internal standards. Quantitation limits of the homologues of LAS were 0.002-0.01 mg/l under these enrichment conditions. The analysis of real samples of laundry and dishwashing detergents was performed. The established high-performance liquid chromatography method was applied to evaluate the stacking CZE method, and compatible results were obtained.

Original languageEnglish
Pages (from-to)143-150
Number of pages8
JournalJournal of Chromatography A
Volume929
Issue number1-2
DOIs
StatePublished - 21 Sep 2001

Keywords

  • Alkylbenzenesulfonates
  • Large-volume sample stacking
  • Linear akylbenzesulfonates
  • Sample stacking
  • Surfactants

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