Journal
ANALYTICA CHIMICA ACTA
Volume 503, Issue 2, Pages 271-278Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2003.10.033
Keywords
triazine compounds; SDS micelles; organic modifiers; ground water samples
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In this work, a capillary electrophoresis (CE) method for the determination of a group of eleven triazine compounds by micellar electrokinetic capillary chromatography (MEKC) with diode array detection was developed. The eleven herbicides studied were: desethylatrazin-2-hydroxy (DEA), simazine. prometon, atrazine, simetryn, ametryn, propazine, prometryn, trietazine, terbutylazine, and terbutryn The separation of these compounds was optimised as a function of buffer concentration and pH, concentration of sodium dodecyl sulphate (SDS) and voltage applied. To increase the selectivity of the separation and the resolution of the solutes, different organic solvents were tested as buffer additives, obtaining the best results when 1-propanol was used. The optimised buffer (24 mM of sodium borate, 18 mM of disodium hydrogen phosphate, 25 mM of SDS, pH 9.5. and 5% of 1-propanol) provides the best separation in terms of resolution and migration time. This method allowed the determination of these compounds at concentrations of 0.05 mug l(-1) in ground water samples pretreated using solid-phase extraction (SPE). (C) 2003 Elsevier B.V. All rights reserved.
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