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通过与5％TBP/煤油萃取Pu(Ⅲ,Ⅳ)相比较,对硝酸介质中二乙基羟胺的稳定性进行了考察。由于亚硝酸的存在,当c(HN0_3)>0.5mol/L时,体系中含有一定比例的Pu(Ⅳ),此时,二乙基羟胺不再稳定,且其不稳定度随硝酸浓度升高而增大,直至完全丧失还原能力。沸水浴加热不能有效去除亚硝酸;加入支持还原剂,如甲基肼,才能使二乙基羟胺稳定。
The stability of diethylhydroxylamine in nitric acid media was investigated by comparing with Pu (Ⅲ, Ⅳ) extracted with 5% TBP / kerosene. Due to the presence of nitrous acid, Pu (Ⅳ) is contained in a certain proportion when c (HN0_3)> 0.5mol / L, at this time, diethylhydroxylamine is no longer stable and its instability increases with the nitric acid concentration Increase, until completely lost the ability to restore. Boiling water bath heating can not effectively remove nitrous acid; added to support the reducing agent, such as methyl hydrazine, in order to make diethyl hydroxylamine stable.