Separation of californium from curium and berkelium from cerium by extraction chromatography

Abstract

ranges and products of decomposition and interaction, it will probably be most useful for the study of polymeric materials and natural products. It should be possible to study large repeating units rather than just the simplest ultimate pyrolysis products. Some pilot work has been done on lignin and humus, and a large number of interesting products has been detected in addition to the expected series of aromatic compounds.Because no thermal conductivity, flame ionization, or other detector is used, it is not necessary to use specific carrier gases for best results. Mechanisms and interactions can be studied in any gas or vapor system-e.g., oxygen, air, nitrogen, helium, hydrogen, carbon dioxide, or mixtures containing water vapor, acids, ammonia, etc.Collection efficiency is surprisingly good; the band of products on the plate is sharply defined. The plate must, however, be decoupled from the heat of the furnace as much as possible. Metal plates and/or efficient cooling may be necessary for operation at temperatures much higher than 500°C. The apparatus has been operated to 1000°C , but borosilicate glass plates had to be used, and it is believed that collection efficiency was appreciably reduced at the higher temperatures. ACKNOWLEDGMENTThe author thanks M. J. Naranjo for considerable help with thin layer chromatographic work and L. E. Edwards for design of the plate holder trolley.

Separation of tervalent lanthanides from actinides by extraction chromatography

“…The advantages of the extraction column chromatographic system of HDEHP on Teflon powder have been discussed by Moore and Jurriaanse (14). The main advantage continues to be its simplicity.…”

“…In addition, analytical methods which utilize thin-layer or liquid chromatography with spectrophotometric or fluores-0003-2700/82/0354-2556S01.25/0 cence detection in order to differentiate between adriamycin and its metabolites have also been developed (6)(7)(8)(9)(10)(11)(12). Finally, in several polarographic studies (13)(14)(15), the electrochemical reduction of adriamycin at mercury electrodes has been reported. Both Rao, Lown, and Plambeck (13) and Molinier-Jumel et al (14) observed two sets of reduction waves at negative potentials, corresponding to the reductions of the quinone center and of the carbonyl side chain, respectively.…”

The Separation of Pure 248Cm from 252Cf by Extraction Chromatography

“…The earliest separation of the tripositive transplutonium ions by means of extraction chromatography techniques with HDEHP were made by Kooi et al [1][2][3] and GAVRILOV et al [4], Hydrophobic kieselguhr was used as the extractant support and dilute hydrochloric acid was the elutriant. Additional data on the Cm-Cf and Ce-Bk separations using HDEHP-teflon columns and dilute nitric acid elutriants have been reported by MOORE and JURRIAANSE [5]. As the availability of the heavier actinide elements increased, more detailed studies of the various parameters involved in their separation by extraction chromatography were made possible.…”

Separation of248Cm from a252Cf neutron source for production of Cm targets

“…Chromatographic separations can be based on extraction chromatography, using e.g. di(2-ethylhexyl)phosphoric acid (HDEHP) [4][5][6], or on anion exchange resins [7]. The most frequently used method, however, is cation exchange separation [8][9][10][11] with an aliphatic α-hydroxy acid as eluent.…”