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

Determination of technetium-99 in environmental samples: A review

“…In this method, the extractant is immobilized on the surface of inert resin beads, corresponding to the organic, stationary phase in solvent extraction and chromatography, respectively. Since commercialization of extraction chromatographic resins by Eichrom Technologies Inc. in 1990's, extraction chromatography has been widely used in radiochemical analysis of 99 Tc [7,10,11,21,25,62,73,[105][106][107].…”

Safety operation of chromatography column system with discharging hydrogen radiolytically generated

“…The extraction chromatography technology is one of the promising methods for the partitioning of minor actinide (MA: Am and Cm) from spent nuclear fuel [1], and Japan Atomic Energy Agency (JAEA) has been conducting research and development for the implementation. In those studies, we carried out design of an appropriate flow sheet [2], laboratory scale separation experiments on a genuine high level liquid waste [3], development of the engineering scale apparatus [4] and inactive repeated separation experiments using the large scale apparatus [5].…”

Rapid Separation of Actinides Using an Anion-exchange Polymer Chain Grafted onto a Porous Sheet

“…Styrene-divinylbenzene copolymer resins containing quaternary ammonium groups have been conventionally used to separate actinides in acidic media [1,2]. Recently, extractant-impregnated resins manufactured by Eichrom Industries (e.g., TEVA [3,4], UTEVA [5], and TRU resins [6][7][8]) have been used as an alternative method because of the specific selectivity for actinides over a wide range of acidities. However, the resins in a bead form have a disadvantage that a longer time is required for ions to diffuse into the interior of the beads with a larger diameter.…”

“…This is due to the negligible mass-transfer resistance of Pu in the pore interior to and from the DEA group of the graft chain during adsorption and elution, respectively. Transport of Pu aided by the permeative flow of the solution through the pore of the DEA disk achieved a quantitative recovery at a tenfold higher flow rate than conventional anion-exchange resins that was governed by the diffusive transport of Pu [3,[6][7][8].…”