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Recent Developments on the Elution by Characteristic Points Method for Rapid and Accurate Determination of Adsorption Isotherms
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för kemi och biomedicinsk vetenskap.ORCID-id: 0000-0003-1819-1709
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för kemi och biomedicinsk vetenskap.ORCID-id: 0000-0002-7123-2066
2011 (Engelska)Övrigt (Övrigt vetenskapligt)
Abstract [en]

Adsorption isotherms are the most important pieces of information needed to understand the analytical and preparative separation system. Several methods are used for their determinations. In this poster we will analyze the elution by characteristic point method (ECP) that is faster and also consumes less amounts analyte and solvent as compared to classic methods such as the frontal analysis (FA) and the perturbation peak method. Classically, ECP is conducted by integrating the diffuse part of an overloaded elution profile, which means that just one single overloaded elution profile and a calibration curve is needed to determine the adsorption isotherm. However, the ECP method is derived assuming that the column has infinite efficiency and that the injection profile is rectangular. All deviation from this will lead to errors in the determined adsorption isotherm. Because the adsorption isotherm is also integrated, a continuous diffuse part of the elution profiles is required. This means that adsorption isotherms from only tailing and fronting peaks could classically only be determined. In this poster we will present: (i) A method to experimentally achieve rectangular injection-profiles [1]. (ii) Determination of the raw slope of the adsorption isotherm data without integrating the elution profile. (iii) Strategies to expand the ECP method for the determination of more complex adsorption isotherms including such containing inflection points [3]. [1] J. Samuelsson, T. Fornstedt, Anal. Chem. 80 (2008) 7887. [2] J. Samuelsson, T. Undin, A. Törncrona, T. Fornstedt, J. Chromatogr. A 1217 (2010) 7215. [3]. J. Samuelsson, T. Undin, T. Fornstedt, J. Chromatogr. A, under review

Ort, förlag, år, sidor
Budapest, 2011.
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kau:diva-29037OAI: oai:DiVA.org:kau-29037DiVA, id: diva2:648111
Tillgänglig från: 2013-09-13 Skapad: 2013-09-13 Senast uppdaterad: 2019-07-12Bibliografiskt granskad

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Samuelsson, JörgenFornstedt, Torgny

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