乙异羟肟酸在硝酸溶液中的稳定性

乙异羟肟酸（AHA）是有望用于乏燃料后处理的新型无盐络合剂。本工作建立了紫外分光光度法和离子色谱法分别测定硝酸溶液中AHA和其水解产物乙酸浓度的方法，研究了硝酸溶液中AHA稳定性以及温度和甲基肼对AHA稳定性和水解产物的影响。结果表明：AHA稳定性随时间和硝酸浓度的增加而降低；温度对AHA在硝酸中的稳定性影响较大；甲基肼能明显提高AHA在硝酸中的稳定性。在一定条件下，AHA在硝酸中具有较好的稳定性，能满足后处理工艺要求。

Stability of Acetohydroxamic Acid in Nitric Acid

Acetohydroxamic acid (AHA) is a new salt-free complexing agent which may be used in the reprocessing of spent fuel. The concentration of AHA in HNO₃ was analyzed by ultraviolet-visible spectrophotometry, and that of acetic acid which was produced by the hydrolysis of AHA was analyzed by ion chromatography. The stability of AHA in HNO₃, the effect of temperature and mono-methylhydrazine (MMH) on the stability of AHA and concentration of acetic acid were studied. Results show that the stability of AHA decreases with the increase of time and HNO₃ concentration, the effect of temperature on the stability of AHA in HNO₃ is obvious, and the stability of AHA in HNO₃ can be enhanced by MMH. At certain condition, AHA is of good stability in HNO₃ and can meet the technological requirement of the reprocessing of spent fuel.