The characterization of olefins with 2,4-dinitrobenzenesulfenyl chloride is described in a recent paper by N. Kharasch and C. M. Bueos, THIS JOURNAL, 71, 2724 (1949).(5) Compare also references 4 and 5 , and forthcoming papers of this series, for other uses of the reagent.(6) This reagent is now available from the Hexagon Laboratories,
Using a standardized procedure previously reported, the distribution of radium and 13 other metallic elements were quantitatively compared, by distributing a radiotracer of the element of interest between an aqueous phase and an organic phase consisting of 0.1 TTA in MIBK.From the ratio of activity in the organic phase to activity in the aqueous phase, distribution coefficients were calculated as a function of pH (Atomic absorption was used for measuring the concentration of magnesium). Using radium-224, the extraction of radium by TTA in MIBK was successfully demonstrated to occur under almost identical pH conditions as previously reported for barium. In addition, distribution coefficients for reversible extractions into the TTA-MIBK phase from the aqueous phase were measured for magnesium, manganese, cobalt, nickel, copper, praseodymium, lead, and thorium. When the log D values were plotted vs. pH for iron, molybdenum, technetium, tungsten, and gold, the normal Sshaped curves were not obtained. From the data, pH conditions can be selected to allow the separation of the daughter elements, radium and lead, from thorium, as well as for many other element pairs.
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