Redox speciation method for neptunium in a wide range of concentrations

A. Kirishima; O. Tochiyama; K. Tanaka; Y. Niibori; T. Mitsugashira

doi:10.1524/ract.91.4.191.19969

Redox speciation method for neptunium in a wide range of concentrations

A. Kirishima, O. Tochiyama, K. Tanaka, Y. Niibori, T. Mitsugashira

Tohoku University

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10^-10 to ∼10^-2.5 M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1 M HClO₄, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500 μl) regardless of its concentration.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Radiochimica Acta
Volume	91
Issue number	4
DOIs	https://doi.org/10.1524/ract.91.4.191.19969
Publication status	Published - 2003

Keywords

Bismuth phosphate
Chemical separation
Impregnated resin
Neptunium
Redox speciation

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10.1524/ract.91.4.191.19969

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title = "Redox speciation method for neptunium in a wide range of concentrations",

abstract = "The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10-10 to ∼10-2.5 M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1 M HClO4, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500 μl) regardless of its concentration.",

keywords = "Bismuth phosphate, Chemical separation, Impregnated resin, Neptunium, Redox speciation",

author = "A. Kirishima and O. Tochiyama and K. Tanaka and Y. Niibori and T. Mitsugashira",

year = "2003",

doi = "10.1524/ract.91.4.191.19969",

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T1 - Redox speciation method for neptunium in a wide range of concentrations

AU - Kirishima, A.

AU - Tochiyama, O.

AU - Tanaka, K.

AU - Niibori, Y.

AU - Mitsugashira, T.

PY - 2003

Y1 - 2003

N2 - The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10-10 to ∼10-2.5 M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1 M HClO4, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500 μl) regardless of its concentration.

AB - The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10-10 to ∼10-2.5 M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1 M HClO4, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500 μl) regardless of its concentration.

KW - Bismuth phosphate

KW - Chemical separation

KW - Impregnated resin

KW - Neptunium

KW - Redox speciation

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DO - 10.1524/ract.91.4.191.19969

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AN - SCOPUS:0038037481

SN - 0033-8230

VL - 91

SP - 191

EP - 196

JO - Radiochimica Acta

JF - Radiochimica Acta

IS - 4

ER -

Redox speciation method for neptunium in a wide range of concentrations

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Keywords

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