Encyclopedia of Chromatography. - New York : Marcel Dekker, 2001 / Cazes J.
- ISBN 0-8247-0511-4
Pages
s. 303-306
Number of pages
4 s.
Language
eng - English
Country
US - United States
Keywords
Field-flow fractionation ; elution modes
Subject RIV
CB - Analytical Chemistry, Separation
R&D Projects
IAA4031805 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ
AV0Z4031919 - UIACH-O
Annotation
Field-flow fractionation is in principle based on the coupled action of a non-uniform flow velocity profile of a carrier liquid with a non-uniform transverse concentration profile of the analyte caused by an external field applied perpendicularly to the direction of the flow. Based on the magnitude of the acting field, on the properties of the analyte and, in some cases, on the flow rate of the carrier liquid, different elution modes are observed. They basically differ in the type of the concentration profiles of the analyte. Three types of the concentration profiles can be derived by the same procedure from the general transport equation. The differences among them arise from the course and magnitude of the resulting force acting on the analyte (in comparison to the effect of diffusion of the analyte). Based on these concentration profiles, three elution modes are described.
