Theoretical‐plate concept in chromatography

Said, A. S.

doi:10.1002/aic.690020412

Cited by 55 publications

(20 citation statements)

References 5 publications

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“…Excellent discussions of column theory may be found in the recent papers of Glueckauf (50,56). Said (57) extended the theory to columns which do not necessarily contain a large num ber of "theoretical plates. "…”

Section: Techniquesmentioning

confidence: 97%

Radiochemical Separations by Ion Exchange

Ka¹,

Nelson²

1957

Annu. Rev. Nucl. Sci.

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During the past few years ion exchange has become firmly entrenched as a separations tool. Its great popularity stems from its theoretical and practical simplicity, its insensitivity to concentration, its versatility and broad applicability, its rapidity for obtaining materials of extremely high purity and, of course, from the ready availability of reasonably stable ion exchange materials. Ion exchange is ideally suited for separations at the trace concentration so typical for radiochemical work and, indeed, ion exchange and radiochemical developments have been closely allied. Further, because ion exchange columns are simple to operate, easily shielded and adaptable to remote control, their use is attractive, even at relatively high activity levels.The war-time work on the Manhattan project on the separation of rare earth and other fission products is generally considered the starting point of the present great interest in the use of ion exchangers for inorganic and radio chemical separations. Since then, application of ion exchangers to radio chemical problems has increased enormously and now includes such widely different fields as analysis, process control, isolation of tracers from target materials, discovery, identification and study of new elements, separation of activities in neutron activation analysis, general investigations of the chemistry of solutions, "hot atom" chemistry, production of radioisotopes, and waste disposal. The isolation of uranium from low grade ores is, in principle, also a radiochemical separation and has become the largest appli cation of ion exchangers outside the water conditioning field.The flood of ion exchange papers originating in many laboratories throughout the world is now so large as to preclude adequate coverage in the limited space of this review, even if attention is confined, as will be done here, to inorganic separations. Complete restriction of the paper to radio chemical applications, although implied by the title, seemed inappropriate since except at highest radiation densities, there is essentially no difference between separations of active or inactive materials. The field to be covered is thus extremely large and, in order to stay within bounds, citation of references had to be severely restricted, and selections often be made on an arbitrary basis. Fortunately, the field is frequently reviewed and a number of recent books (e.g., refs. 1 to 9) and review articles (e.g., refs. 10 to 21) are available. In addition, it is hoped that sufficient individual citations have been made to provide an adequate introduction to recent developments in the field.

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Section: Techniquesmentioning

confidence: 97%

Radiochemical Separations by Ion Exchange

Ka¹,

Nelson²

1957

Annu. Rev. Nucl. Sci.

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“…The equilibrium approach to ion exchange assumes that instantaneous equilibrium is realized at all times during the ion-exchange process. Perhaps DeVault (1943) The concentration on any plate n is shown (Said, 1956) available from standard references (Molina, 1943). However, the formulas must be used with linear adsorption isotherms.…”

Section: Equilibrium Conceptmentioning

confidence: 99%

THE DEVELOPMENT OF THEORETICAL EQUATIONS TO DESCRIBE THE FLOW OF A RADIOACTIVE ION IN GROUND WATER. Annual Report, December 1, 1966--November 30, 1967.

Grove¹

1969

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“…Under these circumstances the second term in Equation (15) becomes, however, negligible and this means that the Equations (14) and (17) now become identical. The following equation is derived by the authors* by superimposing normal diffusion on the vertical transport.…”

Section: Comentioning

confidence: 99%