Title: total velocity of the analyte
Long Title: IUPAC Gold Book - total velocity of the analyte
DOI: 10.1351/goldbook.TT06926
Status: current
Index: quantity

Definition
The sum of electrophoretic velocity, \(\nu_{\rm{ep}}\), of an ion and the electroosmotic velocity, \(\nu _{\rm{eo}}\). \[\nu_{\rm{tot}} = \nu_{\rm{ep}}\,+\,\nu_{\rm{eo}}\] This quantity can be measured experimentally as the effective length of the capillary divided by the migration time (\(L_{\rm{eff}}/t_{\rm{m}}\)).

Notes
1) Depending on the signs and relative magnitudes of these velocities, the total velocity of an analyte can have either the same or the opposite direction to the electroosmotic velocity.
2) The total velocity is the velocity of the ion measured as a displacement relative to the capillary wall divided by time.

Related Terms
- electrophoretic velocity: https://goldbook.iupac.org//terms/view/ET06925
- migration time: https://goldbook.iupac.org//terms/view/MT06924

Source
- PAC, 2004, 76, 443. 'Terminology for analytical capillary electromigration techniques (IUPAC Recommendations 2003)' on page 449 (https://doi.org/10.1351/pac200476020443)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/TT06926/html
- json: https://goldbook.iupac.org/terms/view/TT06926/json
- xml: https://goldbook.iupac.org/terms/view/TT06926/xml

Citation: Citation: 'total velocity of the analyte' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.TT06926
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Accessed: 2026-07-25T02:33:34+00:00