Artículo
Separation of nonylphenol ethoxylates and nonylphenol by non-aqueous capillary electrophoresis
Babay, Paola Alejandra; Gettar, Raquel T.; Silva, María Fernanda
; Thiele, Björn; Batistoni, Daniel Alberto
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Fecha de publicación:
05/2006
Editorial:
Elsevier Science
Revista:
Journal of Chromatography - A
ISSN:
0021-9673
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Capillary electrophoresis based on non-aqueous solvent background electrolytes was employed, with single and multiple wavelength UV detection, to evaluate discrimination among oligomer components of mixtures of non-ionic, long chain nonylphenol ethoxylates (NPnEO, with n = number of ethoxy units) and their lipophilic degradation products. The tested organic solvents included acetonitrile, methanol, ethanol, 1- and 2-propanol, 1-butanol and tetrahydrofurane in the presence of sodium acetate. A rational variation of composition of background electrolyte solvent mixtures allowed to modify the mobility of electroosmotic flow and the type and degree of interactions between the ionic additive (sodium acetate) and the components of the analyte mixtures. The physicochemical properties of the solvents, such as dielectric constant, viscosity and electron donor–acceptor ability regarding the additive, were considered to improve the resolution of lipophilic compounds with less than three ethoxy groups and the discrimination attainable for longer chain oligomers. The studied methodologies also allowed discerning between surfactants of similar (nominal) ethoxy chain lengths. This was demonstrated by the different peak distribution patterns observed for NPnEO compounds with n = 7.5 and 10, respectively.
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Articulos(IBAM)
Articulos de INST.DE BIOLOGIA AGRICOLA DE MENDOZA
Articulos de INST.DE BIOLOGIA AGRICOLA DE MENDOZA
Citación
Babay, Paola Alejandra; Gettar, Raquel T.; Silva, María Fernanda; Thiele, Björn; Batistoni, Daniel Alberto; Separation of nonylphenol ethoxylates and nonylphenol by non-aqueous capillary electrophoresis; Elsevier Science; Journal of Chromatography - A; 1116; 1-2; 5-2006; 277-285
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