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Radiolysis of N,N-dimethylhydroxylamine and its radiolytic liquid organics

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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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Acknowledgment

The authors wish to extend warm acknowledgement for the financial assistance of Natural Science Foundation of China (No. 20771074, 40973073, 40830744) and Shanghai Leading Academic Disciplines (No. S 30109).

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Authors and Affiliations

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

    J. H. Wang, Q. Li, M. H. Wu, G. Xu, Ch. Li & B. R. Bao

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

    W. F. Zheng, H. He & Sh. D. Zhang

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  1. J. H. Wang
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  2. Q. Li
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  3. M. H. Wu
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Correspondence to J. H. Wang.

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Wang, J.H., Li, Q., Wu, M.H. et al. Radiolysis of N,N-dimethylhydroxylamine and its radiolytic liquid organics. J Radioanal Nucl Chem 292, 249–254 (2012). https://doi.org/10.1007/s10967-011-1468-1

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  • DOI: https://doi.org/10.1007/s10967-011-1468-1

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