Radiolytic oxidation of americium(III) to americium(V) and plutonium(IV) to plutonium(VI) in saline solution

Büppelmann, K; Magirius, S.; Lierse, C.; Kim, J.I

doi:10.1016/0022-5088(86)90427-3

Cited by 24 publications

(6 citation statements)

References 7 publications

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“…The oxidation becomes completed within a week [17][18][19]. Radiolysis reactions induced by α-radiation transfer the NaCl solution to a strongly oxidizing medium.…”

Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

“…Radiolysis reactions induced by α-radiation transfer the NaCl solution to a strongly oxidizing medium. The process is depending on the specific α-activity, NaCl concentration and pH [18,19]. Experiment is conducted with 1 Ci/L 241 Am(III) in 3M NaCl solution at pH = 8.3…”

Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

“…While carrying out experiment, it is found that a-radiation induced radiolysis reactions in concentrated Nad solutions become significant, resulting in the oxidation of Am (111) to Am(V) [17][18][19]. For this reason the hydrolysis reactions of Am(V) have been also investigated in a selected saline solution.…”

Section: Introductionmentioning

confidence: 97%

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Hydrolysis Reactions of Am (II I) and Am(V)

Stadler¹,

Kim²

1988

Radiochimica Acta

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Hydrolysis reactions of Am (III) have been investigated in noncomplexing solution as well as saline solutions under CO,-free conditions. The solubility experiment in combination with radiometric pH-titration is carried out for the pH range from 6 to 13, at different ionic strengths. In non-complexing solution, the solubility product is found to be increasing along with an increase of the specific α-activity in a given experimental solution. In concentrated NaO solutions (I è 3M, pH > 7) with high specific inactivities ( > 1 Ci/L), the α-radiolysis starts generating substantial amounts of oxidized chlorine species, e. g. CIO", which results in the oxidation of Am (III) to Am(V). The hydrolysis reaction of Am(V) in 3 Af NaCl is also investigated by radiometric pH-titration. Solubility products (Ksp) of Am(OH) 3 (s) and AmO,(OH)(s) and hydrolysis constants of Am (III) and Am(V) are calculated from the solubility data. The speciation of different hydrolysis products, undertaken by laser-induced photoacoustic spectroscopy (LPAS), has verified probable species assessed theoretically on the basis of solubility experiments.

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“…The oxidation becomes completed within a week [17][18][19]. Radiolysis reactions induced by α-radiation transfer the NaCl solution to a strongly oxidizing medium.…”

Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrolysis Reactions of Am (II I) and Am(V)

Stadler¹,

Kim²

1988

Radiochimica Acta

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“…For the prediction of migration behavior using geochemical or thermodynamic models, solubility limits would be a primary parameter to be determined from stability constants for a number of chemical species in solution. In a previous report on solubilities of americium hydroxide, Am(OH) 3 , hypochlorite ion (OC1") was found to be formed by a strong alpha-radiolysis in chloride media, and the increase in its solubility was due to changes in its oxidation state to Am0 2 + [1]. There was an indication of the formation of PuOi + -OCr complex in another report [2].…”

Section: Introductionmentioning

confidence: 97%

Effects of Hypochlorite Ion on the Solubility of Amorphous Schoepite at 25 °C in Neutral to Alkaline Aqueous Solutions

Kim¹,

Choi²,

Park³

et al. 1994

Radiochimca Acta

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Solubilities of schoepite with hypochlorite ion in 0.1 Μ NaCl solution were measured by Potentiometrie titration method at 25.0 °C, under C0 2 -free atmosphere. Compared with its solubility in the absence of hypochlorite ion, it has been found that hypochlorite ion enhanced its solubility up to 100 times in the neutral pH range. The appearance of a shoulder at 311 nm in UV-Vis spectra indicated the presence of a new chemical species, which might affect on the solubility of schoepite in solution. Furthermore, changes in its solubility at pH 8.3 and in the vibrational frequency (v 3 ) for asymmetric stretching mode of U-Ο double bond at different molar ratios of hypochlorite ion to uranyl ion concentration provided an experimental evidence that a new chemical species was formed with hypochlorite ion. X-ray diffraction patterns for the residual precipitates also showed three different diffraction angles, which is resulted from the introduction of hypochlorite ion in precipitates.

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“…The solution chemistry is complicated still further by the ease of interconversion of the oxidation states such that the proportion of each in a given solution is difficult to predict. These problems may be exacerbated in environmental situations, for example, radiolytic oxidation of Am(III) and Pu(IV) in saline solution has been suggested (albeit at high salt concentrations [9]), while humic substances which complex actinides strongly [10,8] can effect Pu(VI) reduction [11]. Photochemical reduction of both PuO| + and UO| + is well documented [12,13]; PuO| + is readily reduced to Pu(V), with Pu(IV) then arising by disproportionation.…”

Section: Introductionmentioning

confidence: 98%

Metal toxicity effects the biological treatment of aqueous metal wastes: Is a biocatalytic system feasible for the treatment of wastes containing actinides?

Tolley¹,

Smyth²,

Macaskie³

1992

Journal of Environmental Science and Health . Part A: Environme

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The toxicities of uranyl and vanadyl ions and of tri-and tetravalent cations towards the activity of a Citrobacter phosphatase were investigated. The oxycations were inhibitory, but uranyl ion inhibition was overcome in the presence of excess organic phosphate substrate. Precipitation of uranyl ion with liberated inorganic phosphate was implicated as a detoxification mechanism which was substantiated using immobilized cells in a flow-through bioreactor. Application of these studies to the design of a process to treat actinide-bearing aqueous wastes is discussed.

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Radiolytic oxidation of americium(III) to americium(V) and plutonium(IV) to plutonium(VI) in saline solution

Cited by 24 publications

References 7 publications

Hydrolysis Reactions of Am (II I) and Am(V)

Hydrolysis Reactions of Am (II I) and Am(V)

Effects of Hypochlorite Ion on the Solubility of Amorphous Schoepite at 25 °C in Neutral to Alkaline Aqueous Solutions

Metal toxicity effects the biological treatment of aqueous metal wastes: Is a biocatalytic system feasible for the treatment of wastes containing actinides?

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