Uptake of Metal Ions by a New Chelating Ion-Exchange Resin. Part 1: Acid Dependencies of Actinide Ions*

Horwitz, E. P.; Chiarizia, R.; Diamond, H.; Gatrone, Ralph C.; Alexandratos, Spiro D.; Trochimczuk, A. Q.; Crick, Darrell W.

doi:10.1080/07366299308918195

Cited by 124 publications

(66 citation statements)

References 8 publications

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“…Indeed, the trend is usually reversed with U(VI) being sorbed or extracted more strongly than Pu(IV). For example, the U(VI) K d values for sorption onto the Diphonix ® resin, which contains diphosphonic acid groups, are greater than those for Pu(IV) up to 1 M HNO 3 ; at higher HNO 3 concentrations, the U(VI) and Pu(IV) K d values are nearly the same for the Diphonix ® resin [39]. Similarly, TBP extracts U(VI) more strongly than Pu(IV) from nitric acid solutions [3].…”

Section: Selectivity Investigationmentioning

confidence: 96%

Actinide binding by Kläui ligands: REDOX speciation and sorption on an extraction chromatography resin

Levitskaia

Sinkov

Lumetta³

2008

Radiochimica Acta

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Summary. The sorption of Eu(III) and actinide ions in various oxidation states from nitric acid solutions by an extraction chromatography resin containing 1 wt. % of the Kläui ligand Cp® XAD-7HP was examined. At 0.3 M HNO 3 and a metal-to-ligand ratio of 0.07, the relative affinity of the resin for the ions investigated followed the order: tetravalent hexavalent > trivalent > pentavalent; however, the relative affinity for the trivalent and hexavalent ions can be reversed, depending on the extent of ligand loading and the nitric acid concentration. The sorption of the tetravalent ions was exceptionally strong in the entire range of nitric acid concentration examined (0.2 to 8 M HNO 3 ). The large difference in the affinity of the resin with the Kläui ligand for tetravalent actinides compared to hexavalent actinides is unusual for ligands with the P=O donor moiety.Resin samples loaded with various actinide ions were examined spectrophotometrically. No Np(V) and Pu(III) species were identified on the resin; rather, reduction-oxidation (REDOX) reactions occurred during equilibration, resulting in their complete conversion to M(IV) species bound by the Kläui ligand. Similarly, the sorption behavior of Pu(VI) and Np(VI) was complicated by their reduction to M(IV) upon sorption. The observed REDOX processes were apparently driven by the extremely high affinity of the Kläui ligand for the tetravalent ions. The acid-base properties of the methyl derivative of the Kläui ligand were investigated in aqueous solution, and its pK a was found to be highly dependent upon the solution ionic strength. The binding constants of this ligand with various actinide ions measured in a mixed methanol/carbon tetrachloride solvent exhibited qualitative agreement with the sorption selectivity trends.

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Section: Selectivity Investigationmentioning

confidence: 96%

Actinide binding by Kläui ligands: REDOX speciation and sorption on an extraction chromatography resin

Levitskaia

Sinkov

Lumetta³

2008

Radiochimica Acta

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“…Another ion exchanger is Diphonix A with the phosphonic and ammonium or pyridine functional groups (Horwitz et al, 1993). An important group of chelating ion exchangers used for lanthanide separations are those with the iminodiacetate functional groups.…”

Section: Separation Using Chelating Ion Exchangersmentioning

confidence: 99%

Investigation of Sorption and Separation of Lanthanides on the Ion Exchangers of Various Types

Kołodyńska¹,

Hubicki²

2012

Ion Exchange Technologies

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“…Ion exchange separation using large-size columns is therefore a common technique for isolation of Pu in complex matrices. Due to the pronounced ability of actinides in the higher oxidation states to form anionic complexes, anion exchange chromatography using Dowex 1(or Bio-Rad AG 1 or AG MP-1) resins [49,50,56,59,62,73,79], is the most widely accepted method, whereas the cation exchange process is seldom employed [80] .…”

Section: Ion Exchange Chromatographymentioning

confidence: 99%

Determination of plutonium isotopes in waters and environmental solids: A review

Qiao

Hou

Miró

et al. 2009

Analytica Chimica Acta

124

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A number of analytical methods have been developed in the past decades for environmental monitoring of plutonium (Pu) isotopes around nuclear facilities, emergency preparedness as well as for risk assessment of contaminated areas resulting from nuclear weapon tests, nuclear accidents, and the discharge of nuclear waste. This article summarizes and critically compares recently reported methods for determination of Pu isotopes in waters and environmental solid substrates, in which sample pre-treatment is imperative for separation of the target species from matrix ingredients and/or potentially interfering radionuclides prior to detection by radiometric or mass spectrometric detection techniques. Also discussed, via representative examples, is the automation of the entire analytical protocol by on-line extraction chromatography and ion exchange chromatography using flow injection (FI) or sequential injection (SI) approaches.

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Uptake of Metal Ions by a New Chelating Ion-Exchange Resin. Part 1: Acid Dependencies of Actinide Ions*

Cited by 124 publications

References 8 publications

Actinide binding by Kläui ligands: REDOX speciation and sorption on an extraction chromatography resin

Actinide binding by Kläui ligands: REDOX speciation and sorption on an extraction chromatography resin

Investigation of Sorption and Separation of Lanthanides on the Ion Exchangers of Various Types

Determination of plutonium isotopes in waters and environmental solids: A review

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