Comparison of Chemical Extractions and Laser Photoacoustic Spectroscopy for the Determination of Plutonium Species in Near-Neutral Carbonate Solutions

Neu, Mary P.; Hoffman, Darleane C.; Roberts, Kevin E.; Nitsche, H.; Silva, Robert J.

doi:10.1524/ract.1994.6667.special-issue.251

Cited by 27 publications

(34 citation statements)

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“…Several extraction steps are needed for a complete characterization of the redox composition of a plutonium solution. As extracting agents, a solution of 0.025 M 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (PMBP) (from Aldrich, in 99% purity) diluted in xylene and a solution of 0.5 M di(2-ethylhexyl) orthophosphoric acid (HDEHP) (Aldrich) diluted in toluene were used following the procedure described in [16].…”

Section: Liquid-liquid Extractionmentioning

confidence: 99%

Studies of the ternary systems humic substances – kaolinite – Pu(III) and Pu(IV)

Buda¹,

Banik

Kratz

et al. 2008

Radiochimica Acta

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The behaviour of plutonium with respect to its migration in the aquifer has been studied under conditions close to nature. Most relevant under these conditions are Pu(III) and Pu(IV) in contact with humic substances (HS) and minerals. As a model for the host rock, kaolinite (KGa-1b) was chosen. The complexation of Pu(III) and Pu(IV) with Aldrich humic acid (AHA) in aqueous solution at ionic strength 0.1 M was investigated by the ultrafiltration method. The sorption of Pu(III) and Am(III) onto kaolinite (K) as a function of pH and metal-ion concentration was studied under aerobic and anaerobic conditions. The pH edge was found at pH∼5.5 independent of the metal-ion concentration and working atmosphere. The influence of HS on the sorption of Pu(III) and Pu(IV) onto kaolinite was investigated in the ternary systems Pu(III)-K-HS and Pu(IV)-K-HS and for comparison, in the system Th(IV)-K-HS. The dependence on pH, contact time, concentration of HS (for Pu(IV)-K-HS) was studied as well as the sequence in which the components were added. Generally, it was found that HS tend to enhance the sorption onto kaolinite below pH 6 and to decrease sorption at higher pH depending in detail on the sequence in which the components were added. An identification of the species sorbed on the surface of the kaolinite by X-ray absorption spectroscopy, as well as chemically, was attempted and preliminary results are discussed.

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Section: Liquid-liquid Extractionmentioning

confidence: 99%

Studies of the ternary systems humic substances – kaolinite – Pu(III) and Pu(IV)

Buda¹,

Banik

Kratz

et al. 2008

Radiochimica Acta

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“…The vial was shaken for 8 minutes at high speed, centrifuged and the phases separated. Under these conditions, Pu(VI) was extracted into the aqueous phase while Pu(III) and Pu(IV) remained in the organic phase [11,12]. A third extraction used the aqueous phase from the initial TTA extraction at pcH 4.7.…”

Section: Plutonium Oxidation State Determinationmentioning

confidence: 99%

“…The vial was shaken for 10 minutes at high speed, and centrifuged prior to separation of the two phases. In this third extraction step, Pu(V) was extracted into the organic phase and Pu(IV)/hydroxide/oxide polymers remained in the aqueous phase [11,12].…”

Section: Plutonium Oxidation State Determinationmentioning

confidence: 99%

Reduction of Pu(V) by humic acid

André¹,

Choppin²

2000

Radiochimica Acta

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“…Speciation and solubility studies of plutonium in natural water showed that Pu(V) is the predominant oxidation State in Solution [4,5,6,7], In the presence of organic complexants, and at macroscopic concentrations M), Pu(V) tends to reduce to Pu(IV) [8]. The complexation strength of different plutonium oxidation states can be described as follows:…”

Section: Introductionmentioning

confidence: 99%

Complexation of Plutonium(V) with Nitrilotriacetic Acid

1995

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We studied the complexation behavior of Pu(V) with nitrilotriacetic acid (NTA) in the pH ränge 4 to 7. We determined the stabiUty constant for the complex [PuOzNTA]^" at 0.1 M (NaC104) and at 25° C using two independent methods simultaneously: spectrophotometry and potentiometry. We obtained log of 6.71 ± 0.06 and 6.79 ± 0.05 respectively. In the presence of NTA, partial reduction of Pu( V) to Pu(IV) is observed in a few hours. The total reduction of Pu(V) occurs in several days.

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Comparison of Chemical Extractions and Laser Photoacoustic Spectroscopy for the Determination of Plutonium Species in Near-Neutral Carbonate Solutions

Cited by 27 publications

References 0 publications

Studies of the ternary systems humic substances – kaolinite – Pu(III) and Pu(IV)

Studies of the ternary systems humic substances – kaolinite – Pu(III) and Pu(IV)

Reduction of Pu(V) by humic acid

Complexation of Plutonium(V) with Nitrilotriacetic Acid

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