Frederick Nelson

Ion exchange procedures : I. Cation exchange in concentration HCl and HClO4 solutions☆

A broad survey of the cation exchange behavior of the elements in HCL and HClO4 solutions is presented and adsorption functions are given. The results are also summarized in the form of two “Periodic Tables” which give the distribution coefficients of the elements as a function of M HCl and MHClO4. Many elements are strongly adsorbed from concentrated HClO4 solutions. There are large differences in adsorbability between HCl and HClO4 solutions, particularly at high ionic strength. Application of these data to high ionic strength cation exchange separation is illustrated.

ION-EXCHANGE PROCEDURES. IX. CATION EXCHANGE IN HBr SOLUTIONS.

Abstract Results of a systematic study of the cation exchange behavior of elements in HBr solutions are given for a Dowex 50 resin. Many elements show adsorption minima at moderate HBr concentrations folowed by a rapid increase in adsorbability at high HBr concentrations. Marked differences in adsorbabilities of the elements occur, particularly in dilute and concentrated HBr solutions. Implications of the data for separations are discussed and typical separations illustrated.

ION EXCHANGE PROCEDURES. II. SEPARATION OF ZIRCONIUM, NEPTUNIUM AND NIOBIUM.

Abstract An anion exchange procedure for separating trace amounts of neptunium and iobium from each other and from macro-amounts of zirconium is described.

Adsorption on inorganic materials : VII. Hydrous tin oxide and SnO2-filled carbon☆

Abstract An adsorbent based on “filling” the macropores of activated carbon with tin oxide was prepared and characterized. This material, as well as hydrous tin oxide, has an unsually high selectivity for lithium permitting its separation from the other alkali metals. This selectivity is not shown by a number of other hydrous oxides, such as those of Al(III), Fe(III), Zr(IV), and Nb(V).

Ion exchange procedures : III. Separation of uranium, neptunium and plutonium☆

Abstract An anion exhange procedure is described for separating uranium, neptunium and plutonium fro each other and from several non-adsorbed elements.

ION EXCHANGE PROCEDURES. V. SEPARATION OF BARIUM AND RADIUM.

Abstract A cation exchange procedure is described for separating barium and radium. Separation is achieved with EDTA solutions of controlled pH.

Ion exchange procedures : IV. Separation of 234Th (UX1) from uranyl nitrate solutions☆☆☆

Abstract A cation exchange procedure is described for recovering microcurie amounts of carrier-free UX1 (234Th) from uranyl nitrate solution. Two ion exchange columns are employed, one for initial concentration and the other for final purification.

Ion-exchange procedures : VIII. Separation of silver from a number of elements by partition chromatography☆☆☆

Abstract A procedure is described for separating silver from a number of elements by partition chromatography in nitric acid solutions. A small column of a finely divided polyfluorocarbon impregnated with a highly selective extractant for Ag(I) (triisooctyl thiophosphate in carbon tetrachloride) is used to effect separation.

Ion exchange procedures : VI. Cation exchange of ac(III) and Fr(I) in HCl and HClO4 solutions; isolation of 227Ac from 231Pa and 227Ac daughters

Abstract The cation exchange behavior of Ac(III) and Fr(I) in HCl and HClO4 solutions is described and a method for isolating 227Ac from its daughters and from 231Pa is presented.

Ion-exchange procedures : X. Cation exchange in concentrated HClO4-HCl solutions☆

The cation-exchange behavior of a number of elements in concentrated HClO4-HCl mixtures has been studied with a Dowex 50 resin. Adsorption data as a function of acid composition and application of the data to column separations are given. Activity coefficients of HCl and HClO4 in the resin phase have been determined for two- and three-component aqueous systems. Some implications of the results for determination of complex constants of species in the aqueous phase are discussed.