The aqueous geochemistry of the rare-earth elements and yttrium

The effect of nitric acid concentration on the selectivity of a novel extraction chromatographic resin consisting of an octanol solution of 4,4′(5′)-bis(t-butyl-cyclohexano)-18-crown-6 sorbed on an inert polymeric support for strontium over a number of alkali, alkaline earth, and other metal cations was evaluated. The effect of macro quantities of selected elements on strontium retention by the resin was also examined. The resin is shown to exhibit excellent selectivity for strontium over nearly all of the test elements; only lead and tetravalent neptunium, polonium, and plutonium show significant affinity for the material. In addition, concentrations of calcium or sodium ion up to ∼ 0.1 M. are shown not to diminish the sorption of strontium appreciably. Several useful radiochemical separation schemes devised on the basis of the results obtained are described.

A novel strontium-selective extraction chromatographic resin*

Separation and preconcentration of actinides by extraction chromatography using a supported liquid anion exchanger: Application to the characterization of high-level nuclear waste solutions

Synthetic inorganic ion-exchangers-I Hydrous oxides and acidic salts of multivalent metals.

Two new extraction chromatographic resins containing the diglycolamide class of molecules have been prepared and characterized, and potential applications identified. The new resins consist of 40 weight percent N,N,N′N′ tetraoctyldiglycolamide (TODGA) and N,N,N′N′ tetrakis‐2‐ethylhexyldiglycolamide (TEHDGA) sorbed onto 50–100 µm particle size Amberchrom® CG‐71. The new resins have capacities for Eu of approximately 0.086 mmol/mL of bed and are quite stable to extractant leaching. The resins were characterized by measuring the batch uptake of actinides, lanthanides, and yttrium, alkaline earths and 13 selected transition and post‐transition elements from HNO3 and HCl. Based on the uptake data, a number of very efficient separations were achieved using 0.5–2 mL bed volume columns and room temperature operation.

Novel Extraction of Chromatographic Resins Based on Tetraalkyldiglycolamides: Characterization and Potential Applications

Nuclear decay properties of light einsteinium isotopes

The Separation of Milligram Quantities of Americium and Curium by Extraction Chromatography

High speed-high efficiency separation of the transplutonium elements by extraction chromatography☆

Nuclear properties of 254Md, 255Md, 256Md, 257Md and 258Md

The extraction chromatography of californium and einsteinium with a high molecular weight quaternary ammonium nitrate.

E.P. Horwitz

Papers

Nuclear decay properties of light einsteinium isotopes

The Separation of Milligram Quantities of Americium and Curium by Extraction Chromatography

High speed-high efficiency separation of the transplutonium elements by extraction chromatography☆

Nuclear properties of 254Md, 255Md, 256Md, 257Md and 258Md

The extraction chromatography of californium and einsteinium with a high molecular weight quaternary ammonium nitrate.