The complexing of Np(V) by some inorganic ligands

Rao, P. R. Vasudeva; Gudi, N. M.; Bagawde, S.V.; Patil, S. K.

doi:10.1016/0022-1902(79)80520-5

Cited by 31 publications

(16 citation statements)

References 14 publications

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“…4. Since the chloride complexation of the pentavalent actinide ion is negligibly weak [14,27,28] in comparison with hydrolysis reactions in the pH range under investigation, the solubilities shown in Fig. 4 are assumed to be caused by hydrolysis reactions alone.…”

Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

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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Section: Am(v) Hydrolysis In Saline Solutionmentioning

confidence: 99%

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

Stadler¹,

Kim²

1988

Radiochimica Acta

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“…Spectroscopic data [8][9][10] have subsequently been interpreted as providing evidence for the existence of the sulfate complex, and RAO [9] has reported a measurement of the monosulfate stability constant. We have investigated the formation of the monosulfate complex of NpO 2 in aqueous solution using an organic extraction technique.…”

Section: Introductionmentioning

confidence: 99%

“…The sulfate complex of Np(V) has received some attention by investigators [6][7][8][9][10], although early workers [6,7] considered sulfate ion as non-complexing. Spectroscopic data [8][9][10] have subsequently been interpreted as providing evidence for the existence of the sulfate complex, and RAO [9] has reported a measurement of the monosulfate stability constant.…”

Section: Introductionmentioning

confidence: 99%

Sulfate Complexation of Np(V) in Aqueous Solution

Halperin

Oliver

1983

Radiochimica Acta

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Np(V) sulfate /Aqueous complex /Stability constants AbstractThe stability constant of the monosulfate complex of Np(V) has been measured at ionic strengths of /= 0.5, 1.0 and 2.0 and at temperatures of 5, 25 and 45 °C. Entropy and enthalpy values for the process of complex formation have been shown to have relatively large positive values. Inner sphere complexing appears to be supported by these measurements.

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“…The contact time was found to be Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/18/15 6:52 AM sufficient to achieve equilibrium and was believed short enough to avoid any Pu(IV) reduction by HNO2 as has been suggested by VASUDEVA RAO etal. [8]. Reagent grade HF was used in the preparation of HF solutions.…”

Section: Methodsmentioning

confidence: 99%

“…The equation used to fit the data is the following (charges omitted for simplicity). Where the 7's represent the activity coefficients of the subscripted species and the equilibrium constants are defmed in equations (6)- (8).…”

Section: [Puljmentioning

confidence: 99%