Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1291, Issue -, Pages 41-47Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2013.03.023
Keywords
Excess isotherm; Frontal analysis
Funding
- OTKA [K 75717]
- [SROP-4.2.1.B-10/2/KONV-2010-0002]
Ask authors/readers for more resources
Methods are proposed to calculate surface excess isotherms and to use them to derive adsorption isotherms in liquid chromatography. The consequences of these methods are discussed. The excess isotherm of isopropyl alcohol from its aqueous solutions on a C-18 adsorbent was obtained using the minor disturbance method. The slope of the inflection tangent of the excess isotherm provides the position of the plane separating the adsorbed layer and the bulk phase, from which the adsorption isotherm was derived. At low concentrations of isopropyl alcohol, frontal analysis was used to derive the adsorption isotherm on the same adsorbent using an independent method. The isotherm was thus derived from both frontal analysis data and the minor disturbance method. The results obtained are compared. Our results show that the use of the same concentration unit for the calculation and the representation of the data is the only correct way to calculate the excess isotherms in practical applications of liquid chromatography. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available