Hydroxylamine Nitrate Decomposition under Non-radiological Conditions

Pulse radiolysis study on the reactivity of NO3˙ radical toward uranous(iv), hydrazinium nitrate and hydroxyl ammonium nitrate at room temperature and at 45 °C

“…Due to its Pu(IV) to Pu(III) reducing capacity and scavenging properties of nitrous acid and prevention of backoxidation of Pu(III), hydroxyl ammonium nitrate (HAN) was proposed as a reducing agent in the PUREX process. [24][25][26][27] HAN exists in HNO 3 under its protonated form NH 3 OH + (pKa 1 = 5.96 28 ). However, the destruction of HNO 2 occurs much slower than in the presence of HN, according to reaction (3).…”

“…and at high enough HNO 3 concentrations, reaction(28) rate is reduced, which is explained by U(IV) hydrolysis, favored as acidity decreases. The Ermolaev and Krot 78 suggested that the oxidation of U(IV) in HNO 3 after the induction period follows a first order reaction equation, depending on the temperature and H + and NO 3 concentrations.…”

Quantum Cascade Laser Infrared Spectroscopy for Online Monitoring of Hydroxylamine Nitrate

“…To demonstrate the capability of the system to monitor reactions in real time, the reaction between hydroxylamine nitrate and nitric acid was studied. These species will react quickly at high acid concentrations and at high temperatures [ 29 ]. In one configuration, 2 mL of HAN (1M) was placed directly on the ATR work plate preheated to 80°C.…”

“…Spectroscopy promises to fulfill the requirements of online analysis and selectivity for nitrate and nitrite species [ 27 , 28 ]. However, there is no direct spectroscopic measurement in the UV-visible region or mid-IR for HAN in water [ 29 ]. We have developed a new method of in situ or online measurement in aqueous solution, which can be used to effectively monitor key species such as NO 3 − and HNO 2 involved in the redox process chemistry of actinides.…”

Measuring Hydroxylammonium, Nitrate, and Nitrite Concentration with Raman Spectroscopy for ²³⁸Pu Supply Program

“…HA + can decompose by reacting with nitrite generated by alpha radiolysis, which is a significant reaction that the 238 Pu program must consider because of the strong alpha emitter 238 Pu. 4 Nitrites not only decompose HA + , but they can also reoxidize Pu(III). 4 Additionally, nitrites in solution form nitrous acid, which reacts with HA + by the following reactions: 5…”