Article

Thermodynamic behaviour in capillary electrochromatography

Eindhoven University of Technology, Department of Chemical Engineering and Chemistry, Laboratory of Instrumental Analysis, P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Fax: +31 40 245 3762
Journal of Separation Science (impact factor: 2.73). 06/2002; 25(9):569 - 576. DOI:10.1002/1615-9314(20020601)25:9<569::AID-JSSC569>3.0.CO;2-3 pp.569 - 576

ABSTRACT The thermodynamic behaviour of solutes was examined on four reversed-phase (RP) stationary phases under pressure-driven (viz. high performance liquid chromatography, HPLC) and electro-driven (viz. capillary electrochromatography, CEC) conditions. Thermodynamic constants such as standard enthalpy, entropy, and Gibbs free energy were compared for both separation modes. Differences and/or similarities observed were used as a tool in gaining a better understanding of the separation mechanism in CEC compared to HPLC. In addition, effects of temperature on the magnitude of electroosmotic flow (EOF) are explained in detail.

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Keywords

capillary electrochromatography
 
CEC
 
electroosmotic flow
 
Gibbs free energy
 
performance liquid chromatography
 
RP
 
separation mechanism
 
separation modes
 
similarities
 
solutes
 
standard enthalpy
 
thermodynamic behaviour
 

Jan Jiskra