Summary
Optimization of a CE method with indirect UV detection for speciation of sulfur-containing anions is described. Sensitivity, selectivity, and separation using a chromate background electrolyte (the electrolyte most often used for inorganic anions) and a pyromellitate electrolyte are compared. The pyromellitate electrolyte is recommended because its use results in better sensitivity for the ions analyzed. The composition of the electrolyte was 2.25 mM pyromellitic acid, 6.5 mM NaOH, 0.75 mM hexamethonium hydroxide, and 1.6mM triethanolamine, pH 10. Separation of seven sulfur-containing anions with indirect detection at 254 nm was achieved in one run in less than 7 min.
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Pobozy, E., Jarczynska, M. & Trojanowicz, M. Speciation of sulfur-containing anions by use of capillary electrophoresis. Chromatographia 56, 723–728 (2002). https://doi.org/10.1007/BF02492474
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DOI: https://doi.org/10.1007/BF02492474