Separation and preconcentration of uranium from acidic media by extraction chromatography

Horwitz, E. P.; Dietz, Mark L.; Chiarizia, R.; Diamond, H.; Essling, A.M.; Graczyk, Donald G.

doi:10.1016/0003-2670(92)85276-c

Cited by 439 publications

(223 citation statements)

References 23 publications

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“…The "long" column method uses long Teflon columns (10.5 cm) filled with 3 ml AG1-X8 anionexchange resin (Dauphas et al, 2009b;Craddock and Dauphas, 2011). The "UTEVA" column method uses prepackaged 1 mL Eichrom UTEVA resin cartridges (Horwitz et al, 1992;Tissot and Dauphas, 2011). All samples measured following purification by the three chemistry protocols yield identical iron isotope compositions within analytical uncertainty ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Iron isotope fractionation in planetary crusts

Wang

Moynier

Dauphas

et al. 2012

Geochimica et Cosmochimica Acta

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We present new high precision iron isotope data (d 56 Fe vs. IRMM-014 in per mil) for four groups of achondrites: one lunar meteorite, 11 martian meteorites, 32 howardite-eucrite-diogenite meteorites (HEDs), and eight angrites. Angrite meteorites are the only planetary materials, other than Earth/Moon system, significantly enriched in the heavy isotopes of Fe compared to chondrites (by an average of +0.12& in d 56 Fe). While the reason for such fractionation is not completely understood, it might be related to isotopic fractionation by volatilization during accretion or more likely magmatic differentiation in the angrite parent-body. We also report precise data on martian and HED meteorites, yielding an average d 56 Fe of 0.00 ± 0.01&. Stannern-trend eucrites are isotopically heavier by +0.05& in d 56 Fe than other eucrites. We show that this difference can be ascribed to the enrichment of heavy iron isotopes in ilmenite during igneous differentiation. Preferential dissolution of isotopically heavy ilmenite during remelting of eucritic crust could have generated the heavy iron isotope composition of Stannern-trend eucrites. This supports the view that Stannern-trend eucrites are derived from main-group eucrite source magma by assimilation of previously formed asteroidal crust.These new results show that iron isotopes are not only fractionated in terrestrial and lunar basalts, but also in two other differentiated planetary crusts. We suggest that igneous processes might be responsible for the iron isotope variations documented in planetary crusts.

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Section: Methodsmentioning

confidence: 99%

Iron isotope fractionation in planetary crusts

Wang

Moynier

Dauphas

et al. 2012

Geochimica et Cosmochimica Acta

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“…1 It is well known that Pu(IV) and U(VI) strongly adsorb onto the resin from a 3 M nitric acid solution. 1 Since the most likely valance states of Pu and U in the solution are tetravalent and hexavalent, respectively, 15 both elements are retained in the resin.…”

Section: Pu Separation From U Using Uteva Resinmentioning

confidence: 99%

“…The UTEVA resin was originally developed by Horwitz et al 1 to concentrate U(VI), and is comprised of diamylamylphosphonate adsorbed on an inert polymeric support. The resin has also been used for the chemical separation of Pu because of its strong affinity to Pu.…”

Section: Introductionmentioning

confidence: 99%

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Development of Rapid Plutonium Analysis for Environmental Samples by Isotope Dilution/Inductively Coupled Plasma Mass Spectrometry with On-line Column

Ohtsuka

Takaku

Kimura³

et al. 2005

ANAL. SCI.

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This paper describes our development of a rapid on-line column/ID-ICP-MS technique for the analysis of plutonium (Pu) in environmental samples using an UTEVA ® extraction chromatograph resin (UTEVA resin) column. It took only 40 min to separate and measure Pu in the sample solution, including the time for conditioning the resin column for the next analysis. In our method, Pu in a 3 M nitric acid solution was fed to the UTEVA resin, and then eluted from the resin by reducing Pu to Pu(III) with 3 M nitric acid mixed with 0.01 M ascorbic acid after washing the resin. The outflow from the resin column was directly introduced to an ICP-MS system. The low concentration of ascorbic acid and the small volume of the eluting solution (0.6 mL) made successive stable analysis possible without any skimmer cone clogging. The chemical recovery of Pu during column operation was 70%, and typical lower detection limits for 239 Pu, 240 Pu and 242 Pu were 9.2, 4.3 and 7.5 fg (21, 36 and 1.1 µBq), respectively. We analyzed five international standard materials for Pu, and obtained good results.

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“…(Horwitz, et al, 1993) d Separation and Preconcentration of Uranium from Acidic Media by Extraction Chromatography (Horwitz, et al, 1992) e Bechtel Nevada Analytical Services Laboratory Procedures Manual (BN, 1998) …”

Section: A210 Geologymentioning

confidence: 99%

Corrective Action Decision Document/Closure Report for Corrective Action Unit 500: Test Cell A Septic System, Nevada Test Site, Nevada, Rev. 0

Nv¹

2000

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Separation and preconcentration of uranium from acidic media by extraction chromatography

Cited by 439 publications

References 23 publications

Iron isotope fractionation in planetary crusts

Iron isotope fractionation in planetary crusts

Development of Rapid Plutonium Analysis for Environmental Samples by Isotope Dilution/Inductively Coupled Plasma Mass Spectrometry with On-line Column

Corrective Action Decision Document/Closure Report for Corrective Action Unit 500: Test Cell A Septic System, Nevada Test Site, Nevada, Rev. 0

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