By T. Braun and G. Ghersini (Eds.)
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PH were given (see Fig. 1. in Chapter 11) at various dithizone concentrations. Straight lines of slope 2 were obtained at each concentration, corresponding to the charge of zinc ions. 7 unit. This value coincided with that theoretically predicted from the above equation. 3 in other publications. These results prove that the same distribution equilibrium is valid in liquid-liquid and chromatographic extraction. Let us now consider the case of a complexing agent X present in the system, that forms a complex MX, in the aqueous phase stepwise, but does not participate in the extraction.
Total concentrations) of the metal in both phases in equilibrium is expressed as the distribution ratio D (often called extraction coefficient E",. When various species B, , B2, etc. are present, all containing the metal M, D is expressed by: When two metals (MI and M2) have to be separated, and their separation factor, is close to 1, the above-mentioned continuous or multiple extraction must be applied for successful separation. Partition chromatography, devoted to this field with such effect by Martin and Synge, is principally considered a kind of countercurrent extraction, where the components are distributed between two liquid phases, one of which is held on a solid support (this is the less polar solvent in reversed-phase methods), while the other one moves in a given direction.
Phys.. 13 (1957) 507. H. S. FRANK, W. Y . WEN, Disc. Farad. SOL, 24 (1957) 133. J. C. , New York, 1965. E. P. HORWITZ. C. A. A. BLOOMQUIST, J. Inorg. Nucl. , 34 (1972) 3851. S. SIEKIERSKI, R. SOCHACKA, J . , 16 (1964) 385. R. SOCHACKA, S. SIEKIERSKI, 3. , 16 (1964) 376. H. GROSSE-RUYKEN, J. BOSHOLM, J. Prakt. , 25 (1964) 79. 1. FIDELIS, S. SIEKIEPSKI, J. , 17 (1965) 542. E. RRMANN. J . , 38 (1968) 498. E. F. HORWITZ. C. A. A. BLOOMQUIST, D. J. HENDERSON, J. Inorg. Nucl. Chern.. 31 (1969) 1149. I.
Extraction Chromatography by T. Braun and G. Ghersini (Eds.)