乙异羟肟酸在硝酸溶液中的稳定性

摘要

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 ana‐lyzed by ultraviolet‐visible spectrophotometry ,and that of acetic acid which was pro‐duced 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 A HA in HNO3 is obvious ,and the stability of A HA 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 .%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。