IUPAC - mass distribution ratio (MT06928)

mass distribution ratio, $k_{MEKC}$

in micellar electrokinetic chromatography

https://doi.org/10.1351/goldbook.MT06928

Defined as:

k_{MEKC} = \frac{n_{mc}}{n_{aq}} = K \cdot \frac{V_{mc}}{V_{aq}}

where

n_{mc}

and

n_{aq}

are the chemical amounts of the analyte in the micellar and aqueous phases, respectively,

K

is the distribution constant and

V_{mc}

and

V_{aq}

are the corresponding volumes of the phases.

Notes:

In the case of an electrically neutral analyte, $k_{MEKC}$ can be calculated directly from the migration times: $k_{MEKC} = \frac{t_{m} - t_{eo}}{t_{eo} (1 - t_{m} / t_{mc})}$
$k_{MEKC}$ should not be confused with the retention factor (in column chromatography) $k$ . However, $k_{MEKC}$ is analogous to the mass distribution ratio (in chromatography).

Source:
PAC, 2004, 76, 443. (Terminology for analytical capillary electromigration techniques (IUPAC Recommendations 2003)) on page 449 [Terms] [Paper]

Citation: 'mass distribution ratio' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.MT06928 RIS BibTex EndNote

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Version 3.0.1 (8049 Terms)

mass distribution ratio, $k_{MEKC}$

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Version 3.0.1 (8049 Terms)

mass distribution ratio, kMEKC

mass distribution ratio, $k_{MEKC}$