Mass distribution ratio

Mass Distribution ratio. Dm(k ). The fraction (1-R) of a component in the stationary phase divided by the fraction (R) in the mobile phase. IUPAC recommends this term in preference to capacity factor. 

The equilibrium in equation (94) is generally defined as a mass-distribution ratio such as that shown above for cation-exchange resins (equation 93), and the position of the equilibrium is determined by the relative Concentration of the counter-ion ML/- and the co-ion X-. The nature of the quaternary amine has little effect on the equilibrium properties of the resin, and the chemistry of metal complex formation in aqueous solution is the dominant factor. 

Mass distribution ratio (in micellar electrokinetic chromatography), /cmekc — Defined as ... 

Mass distribution ratio in microemulsion electrokinetic chromatography, /cMeekc — Defined analogously to the -> mass distribution ratio (in - micellar electrokinetic chromatography), kMEKC, by replacing terms for micelles with corresponding terms for micro emulsion. 

Capacity Factor k(Dj. See Mass distribution ratio. (In GSC, Va > VlI thus smaller p values and k values occur.) This is a measure of the ability of the column to retain a sample component ... 

Mass distribution ratio in microemulsion electrokinetic chromatography, /cmeekc — Defined analogously to the... 

Several important parameters to characterize the separation and the efficiency can be directly deduced from the chromatogram. The retention time of the component i is the residence time of the component i and can be measured directly from the chromatogram as the time distance between the sample injection and the top of the peak due to component i (see Fig. 1). From this, a number of other parameters can be calculated (Table 4). The capacity ratio or mass distribution ratio hfi (Eq. 1) is defined as the ratio of the amount of i in the stationary and the mobile phase, respectively. The capacity ratio is the product of the distribution coefficient and the phase ratio. It follows that the analyte molecules spend an average time fraction of 1 / ( -I- 1) in the mobile phase and of ( + 1) in the stationary phase. Analytes with different retention times spend different periods of time in the stationary phase. The separation factor a , of the phase system for the components i and j (Eq. 2) is another important parameter characterizing the separation. 

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