English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/121905
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Behaviour of the isothermal retention indices of n-alkylbenzenes on stationary phases of different polarity

AutorSantiuste, J. M. ; Quintanilla-López, Jesús Eduardo ; Takács, J. M.; Lebrón-Aguilar, R.
Fecha de publicación2015
CitaciónJournal of Chromatography A 1222: 90-97 (2015)
ResumenIsothermal retention indices (I) of benzene, toluene, ethylbenzene, n-propylbenzene and n-butylbenzene were determined at 323-423K on twelve WCOT capillary columns covering a broad stationary phase polarity spectrum. These I values have been tested carrying out a comparison with the NIST database values. The effect of the stationary phase polarity on I values was studied. But for the poly(3,3,3-trifluoropropylmethyl siloxane) column, a good linear correlation was found. At each temperature, the dependence on I of the alkyl chain length (z) attached to the ring of the n-alkylbenzenes was linear and of similar magnitude for the stationary phases of low to middle polarity, but lower for the more polar ones. Moreover, an important influence of the column temperature on the slope of the I vs. z plots was observed for the only non polysiloxane-type stationary phase studied, i.e., poly(ethylene glycol), due to its higher chain stiffness. Finally, different expressions describing the effect of the temperature on the retention index have been compared. I values of the n-alkylbenzenes in the 323-423K range increase with increasing column temperature according to the Antoine-type (I=α+β(γ+T) -1) and the extended (I=a+bT -1+clnT) models. No significant differences were observed between them, except for the poly[70% bis(3-cyanopropyl) 30% dimethyl silphenylene-siloxane] column, for which the Antoine-type model was slightly better.
Identificadoresdoi: 10.1016/j.chroma.2011.12.007
issn: 0021-9673
e-issn: 1873-3778
Aparece en las colecciones: (IQOG) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.