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By Friedrich G. Helfferich, Gerhard Klein

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T Boundary is an accepted, although perhaps not very fortunately chosen, term in chromatography and electrophoresis. In other theories o f chromatography, boundaries have been variously called fronts, concentration changes, waves, and transitions. 20 2 DEFINITIONS AND BASIC CONCEPTS Composition Routes. The sequence of compositions in a composition profile or history can be mapped in the composition space or simplex. The resulting curve is called a composition route. There are composition profile routes and composition history routes, and either may be in terms of mobile-phase, stationary-phase, or overall concentrations.

It was shown in the previous section that all distribution ratios, in response to composition changes, remain constant or increase or decrease together. According to Eq. 12) (where primes and double primes refer to two different compositions). Where the species with lower affinities are present in higher proportions, all distribution ratios are higher and all species velocities thus are lower. 2 illustrates the composition dependence for a typical threecomponent system, where the loci of constant species velocities are parallel straight lines.

Interference implies that the stationaryphase concentration of any given species depends not only on the mobilephase concentration of that species, as in systems without interference, but also on the concentrations of all other species [see Eq. 13)]. The premises in the previous section specify particular equilibrium properties, which will now be examined. From Eqs. 7) 36 3 THEORETICAL BASIS These relations are general since they are derived exclusively from definitions. With the premises of constant total concentrations in both phases and Eq.

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Multicomponent chromatography; theory of interference by Friedrich G. Helfferich, Gerhard Klein


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