T. Braun and G. Ghersini (Eds.)'s Extraction Chromatography PDF

By T. Braun and G. Ghersini (Eds.)

ISBN-10: 0080858023

ISBN-13: 9780080858029

ISBN-10: 0444998780

ISBN-13: 9780444998781

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It is rather difficult to treat concisely the equilibria of formation and partition of extracted complexes in ion-association systems, though the formula of mass-action may also be applied as in chelate extraction systems. The reasons for this difficulty are that a large number of equilibria, such as higher aggregate formation, are involved in the ion-association system, and that most of the activity coefficients are uncertain because of the high concentrations of electrolytes employed. The equilibrium of extraction of a metallic species Mn+ by a long-chain aliphatic amine or ammonium compound from an aqueous phase containing a singly-charged anion X (when M"' exists as an anionic complex and the amine RN is previously equilibrated with acid HX) may be expressed as follows: 33 In extraction chromatography using amines or ammonium compounds, a great number of Rf spectra are available for different compositions of the aqueous solution used as eluent, and for almost all elements.

References [16] and [29] report curves obtained by the two methods, using several kinds of extractants. Peppard’s presentation of the data of Siekierski’s group [30] (D) and the results of Pierce et al. (B) [32a] are illustrated in Fig. 1. together with that of liquid-liquid extraction results (C, B). Curve (A) is a trial curve of the *$tetradeffect” drawn from the extraction chromatography data for a synergistic extraction system (33), which will be discussed later. It is clear from the Figure that the variations of separation factor vs.

These factors, which are in most cases correlated, affect the peak width and tailing of the elution curve, and accordingly influence the distribution ratio and HETP, that is the overall efficiency of the column. Furthermore, it is difficult to keep the chromatographic parameters A,,, and As, and the other experimental conditions constant throughout the processes of dynamic chromatography. When this characteristic feature of chromatography is taken into consideration, a certain flexibility should be given in its comparison with liquid-liquid batch extraction.

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Extraction Chromatography by T. Braun and G. Ghersini (Eds.)


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