Authors:
J. Wang Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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Q. Li Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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M. Wu Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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G. Xu Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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Ch. Li Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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B. Bao Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan, P. O. Box 144, Shanghai, 200444 China

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W. Zheng Radiochemistry Department, China Institute of Atomic Energy, P. O. Box 275 (26), Beijing, 102413 China

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H. He Radiochemistry Department, China Institute of Atomic Energy, P. O. Box 275 (26), Beijing, 102413 China

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Sh. Zhang Radiochemistry Department, China Institute of Atomic Energy, P. O. Box 275 (26), Beijing, 102413 China

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Abstract  

N,N-dimethylhydroxylamine (DMHA) is a novel salt-free reducing reagent used in the separation U from Pu and Np in the reprocessing of power spent fuel. This paper reports on the radiolysis of aqueous DMHA solution and its radiolytic liquid organics. Results show that the main organics in irradiated DMHA solution are N-methyl hydroxylamine, formaldehyde and formic acid. The analysis of DMHA and N-methyl hydroxylamine were performed by gas chromatography, and that of formaldehyde was performed by ultraviolet–visible spectrophotometry. The analysis of formic acid was performed by ion chromatography. For 0.1–0.5 mol L−1 DMHA irradiated to 5–25 kGy, the residual DMHA concentration is (0.07–0.47) mol L−1, the degradation rate of DMHA at 25 kGy is 10.1–30.1%. The concentrations of N-methylhydroxylamine, formaldehyde and formic acid are (8.25–19.36) × 10−3, (4.20–36.36) × 10−3 and (1.35–10.9) × 10−4 mol L−1, respectively. The residual DMHA concentration decreases with the increasing dose. The concentrations of N-methylhydroxylamine and formaldehyde increase with the dose and initial DMHA concentration, and that of formic acid increases with the dose, but the relationship between the concentration of formic acid and initial DMHA concentration is not obvious.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)