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ERIC Number: EJ863152
Record Type: Journal
Publication Date: 2009-Jul
Pages: 7
Abstractor: As Provided
Reference Count: 22
ISSN: ISSN-0021-9584
A Theoretical Analysis of the Influence of Electroosmosis on the Effective Ionic Mobility in Capillary Zone Electrophoresis
Hijnen, Hens
Journal of Chemical Education, v86 n7 p869-875 Jul 2009
A theoretical description of the influence of electroosmosis on the effective mobility of simple ions in capillary zone electrophoresis is presented. The mathematical equations derived from the space-charge model contain the pK[subscript a] value and the density of the weak acid surface groups as parameters characterizing the capillary. It is shown how the zeta potential of the capillary and the effective mobility of typical anions are affected by the pH and ionic strength of the background electrolyte. Furthermore, the model is also used to analyze experimental results on the pH dependency of the electroosmotic mobility in a fused silica capillary, yielding estimates for the pK[subscript a] values of two types of silanol groups and the total surface density of these groups. With these estimated values for the properties of the silanol groups, the model predictions of the effective mobility are compared with literature data. (Contains 5 figures.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A