Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (2): 27 doi: 10.1007/s41365-018-0360-x

• NUCLEAR CHEMISTRY,RADIOCHEMISTRY,RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

γ-Ray radiolysis of acetohydroxamic acid in HNO3 and its radiolytic product

Jin-Hua Wang 1, Chao Li 1, Qian Li 1, Ming-Hong Wu 1, Wei-Fang Zheng 2, Hui He 2   

  1. 1 School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, China
    2 Radiochemistry Department, China Institute of Atomic Energy, Box 275, Beijing 102413, China
  • Contact: Jin-Hua Wang E-mail:jinhuawang@staff.shu.edu.cn
PDF ShareIt Export Citation
Jin-Hua Wang, Chao Li, Qian Li, Ming-Hong Wu, Wei-Fang Zheng, Hui He. γ-Ray radiolysis of acetohydroxamic acid in HNO3 and its radiolytic product.Nuclear Science and Techniques, 2018, 29(2): 27     doi: 10.1007/s41365-018-0360-x

Abstract:

Acetohydroxamic acid (AHA) is a novel saltfree reagent used for the separation of Pu and Np from U in the advanced Purex process. This paper reports the c-ray damage of AHA in HNO3 and its radiolytic product. For 0.2 mol L-1 AHA in 0.2–2.0 mol L-1 HNO3 irradiated at a dose of 5–25 kGy, the radiolytic rate of AHA is 6.63–77.5%, and it increases with the HNO3 concentration and absorbed dose. The main radiolytic gases are N2O and H2, with volume fractions of (0.500–16.2) 9 10-2 and (1.30–11.8) 9 10-3, respectively, and they increase with the absorbed dose; the H2 volume fraction decreases with increasing HNO3 concentration. The main liquid radiolytic products are CH3COOH and HNO2, and their concentrations are (3.40–19.7) 9 10-2 and (0.200–4.80) 9 10-3 - mol L-1, respectively, which increase with the HNO3 concentration. Since a significant concentration of HNO2 is present in the irradiated AHA-HNO3 solution, a holding reductant must be used to destroy HNO2 and stabilize Pu(III) and Np(V) when AHA is applied for the separation of Pu and Np from U.

Key words: Acetohydroxamic acid, γ-Ray radiolysis, Radiolytic product, Complexant reductant, Purex process