Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 929, Issue 1-2, Pages 143-150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(01)01165-7
Keywords
large-volume sample stacking; sample stacking; alkylbenzenesulfonates; linear alkylbenzenesulfonates; surfactants
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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. (C) 2001 Elsevier Science BY All rights reserved.
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