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Systematic Approach to the Separation of Mono- and Hydroxycarboxylic Acids in Environmental Samples by Ion Chromatography and Capillary Electrophoresis by Silvia R Souza; Marina F.M Tavares; Lilian R.F de Carvalho is a Chemistry article available to read on EtoBox.

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Strategies for method development and optimization of conditions in ion chromatography (IC) and capillary electrophoresis (CE) are proposed. The approaches are based on well established theoretical models for analyte elution and rely on the inspection of effective capacity factor versus specific gradient ramp slope curves for IC and effective mobility versus pH curves for CE. Commonly used IC eluent systems, such as sodium hydroxide and sodium borate, and the CE electrolyte 3,5-dinitrobenzoic acid were investigated. A standard aqueous solution containing formate, acetate, a-hydroxyacetate (glycolate), propionate, a-hydroxypropionate (lactate), butyrate and b-hydroxybutyrate anions was used to test the analytical conditions indicated by the models. Among the IC eluent systems, borate presented a better separation performance than hydroxide. However, a complete resolution of all components in the standard mixture was not accomplished experimentally at the chosen gradient ramp slope of 0.05 mM / ml. The analyte pairs acetate / lactate and glycolate / butyrate, whose effective capacity factors differ by approximately 0.2 units, co-eluted at 0.17 and 0.24 resolution, respectively, and t

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Author

Silvia R Souza; Marina F.M Tavares; Lilian R.F de Carvalho

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)