γ-Radiolysis study of concentrated nitric acid solutions

Abstract

The formation of nitrous acid has been studied in the 'OC0-y radiolysis of concentrated nitric acid solutions. The yields of nitrous acid are proportional to the electron fraction of nitric acid, on the basis of which, an additional reaction path, NO; O(3P) + NO; with a primary yield of 0.16 pmol J -' , has been verified for the direct action of radiation on nitric acid.

Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

“…Radiolysis of nitrate ions in a neutral or acid solution has been extensively described in the literature for γ radiolysis (Jiang et al, 1994;Miner and Seed, 1967;Vladimirova, 1964). It is accepted that nitrate ion radiolysis results in the formation of nitrite ions (NO 2 À ) or nitrous acid (HNO 2 ) depending on the acidity (pKa HNO 2 /NO 2 nitrate ions to eventually form NO 2 À following an indirect radiolysis process (Daniels and Wigg, 1967;Jiang et al, 1994):…”

“…It is accepted that nitrate ion radiolysis results in the formation of nitrite ions (NO 2 À ) or nitrous acid (HNO 2 ) depending on the acidity (pKa HNO 2 /NO 2 nitrate ions to eventually form NO 2 À following an indirect radiolysis process (Daniels and Wigg, 1967;Jiang et al, 1994):…”

Effects of seawater components on radiolysis of water at elevated temperature and subsequent integrity of fuel materials

“…The dilution ratio of seawater (= concentration of Cl − in solution/concentration of Cl − in seawater) was changed for the calculation. G-values of chemical species i at chloride concentration, C, at the elevated temperature, T, G i (C,T) were assumed to be given as follows with G-values for pure water at T, G i, pure water (T) and G-values for 5 M(= mol·dm −3 ) NaCl at room temperature, G i, 5 M-NaCl [4] based on analogy to the radiolysis of concentrated nitric acid [15] ( Table 1).…”

The role of organic solvent radical cations in separations ligand degradation

“…Among the species produced in the aqueous phase are the reactive products of water and nitric acid radiolysis: [10,11] …”