Author
E.P. Horwitz
Bio: E.P. Horwitz is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Nitric acid & Uranium. The author has an hindex of 16, co-authored 22 publications receiving 814 citations.
Papers
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126 citations
TL;DR: Gibb's isotherm curves were run for a series of dialkyl phosphoric, phosphonic, and phosphinic acids, most in dodecane against 1 M HNO3 at 25°C as discussed by the authors.
90 citations
TL;DR: In this article, a chemical procedure for super-heavy element searches in irradiated uranium targets is outlined, based on the wide range in stability and extractability of chlorometallic complexes by alkyl tertiary and quaternary ammonium chlorides.
82 citations
TL;DR: In this paper, a consistant and revealing mechanism of extraction of calcium ion from di(2-ethylhexyl)phosphoric acid (DEHP) was proposed, in which a structured layer of water at the interface impedes the progress of the ion from the bulk aqueous phase to the interface.
63 citations
TL;DR: In this paper, a comparison of the characteristics of the mass distribution for low-energy fission of nuclides ranging from −227 to −256 fission was given, and the average masses of the light and heavy groups were 111.9 and 141.0, respectively.
Abstract: The distribution of mass in the spontaneous fission of $^{256}\mathrm{Fm}$ has been investigated by the radiochemical determination of the fission yields for 28 mass chains. The mass distribution is asymmetric with a peak-to-valley ratio of \ensuremath{\sim}12. The average masses of the light and heavy groups are 111.9 and 141.0, respectively. The fission-yield data indicate a value of 3 \ifmmode\pm\else\textpm\fi{} 1 for $\overline{\ensuremath{
u}}$, the average number of neutrons emitted per fission. A comparison of the characteristics of the mass distribution for low-energy fission of nuclides ranging from $^{227}\mathrm{Th}$ to $^{256}\mathrm{Fm}$ is given.
58 citations
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TL;DR: Theoretical considerations suggest that trivalent REE and Y should exhibit strong, predominantly electrostatic complexing with hard ligands such as fluoride, sulfate, phosphate, carbonate and hydroxide and this is borne out by the available experimental data.
735 citations
TL;DR: In this paper, 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.
Abstract: 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.
686 citations
TL;DR: In this paper, a quaternary amine-based liquid anion exchanger was used for the extraction of actinides from nitric and hydrochloric acids, which exhibited preferential retention of tetravalent actinide over a wide range of acidities.
437 citations
TL;DR: Die Ubersicht schliesst die Herstellung, Eigenschaften, Anwendbarkeit and Theorie of diesen Substanzen ein.
354 citations
TL;DR: In this article, two new extraction chromatographic resins containing the diglycolamide class of molecules have been prepared and characterized, and potential applications identified, and the new resins consist of 40 weight percent N,N,N′N′ tetraoctyldiglycamide (TODGA) and N, n,N',N′ n′ tetrakis−2−ethylhexylhexylcylcoxyldigcylcolamide (TEHDGA) sorbed onto 50-100µm particle size Amberchrom® CG
Abstract: 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.
332 citations