Enantiomeric separation of organophosphorus pesticides by capillary electrophoresis. Application to the determination of malathion in water samples after preconcentration by off-line solid-phase extraction
Authors
García Ruiz, Carmen; Álvarez Llamas, Gloria; Puerta, Ángel; Blanco, Elisa; Sanz Medel, Alfredo; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/1351DOI: 10.1016/j.aca.2005.04.027
ISSN: 0003-2670
Publisher
Elsevier
Date
2005Funders
Authors thank the Ministry of Science and Technology (Spain) for the research project BQU2003-03638. C. García Ruiz also thanks this Ministry for the Ramón y Cajal program (RYC-2003-001)
Bibliographic citation
Analytica Chimica Acta, 2005, v. 543 p. 77-83
Keywords
Enantiomeric separation
Organophosphorus pesticides
Capillary electrophoresis
Malathion
Solid-phase extraction
Project
info:eu-repo/grantAgreement/MICYT//BQU2003-03638/ES/CROMATOGRAFÍA ELECTROCINÉTICA: UNA PODEROSA HERRAMIENTA PARA LA SEPARACIÓN ENANTIOMÉRICA DE COMPUESTOS QUIRALES CON APLICACIÓN A LA DETERMINACIÓN DE LA PUREZA ENANTIOMÉRICA
info:eu-repo/grantAgreement/MEC//RYC-2003-001/ES/RYC-2003-001/
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
http://dx.doi.org/10.1016/j.aca.2005.04.027Rights
© Elsevier, 2005
Access rights
info:eu-repo/semantics/openAccess
Abstract
The separation of the enantiomers of a group of organophosphorus pesticides (OPs) has been investigated by electrokinetic chromatography (EKC) using different anionic cyclodextrins as chiral selectors. The use of a 25 mM Tris buffer (pH 7.0), 20 mM in CM-β-CD together with an applied voltage of 24 kV and a temperature of 25 °C enabled the individual enantiomeric separation of malathion and phenthoate each one into its two enantiomers, the partial separation of the enantiomers of phenamiphos and the separation of three of the four enantiomers of isomalathion. Since naled is very reactive in aqueous solutions, its enantiomeric separation achieved in about 8 min in 25 mM borate buffer at pH 9 with 10 mM CM-β-CD resulted in the observation of a broad peak due to degradation products. A preconcentration step by disk solid-phase extraction was studied and used together with the chiral EKC method developed for the enantiomeric separation of malathion in order to determine this pesticide in tap water samples spiked at the μg mL−1 level. Finally, the precision and recovery of the method was established.
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OPs AnalChimActa, 543, 77-83 ... | 175.7Kb |
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OPs AnalChimActa, 543, 77-83 ... | 175.7Kb |
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