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- W2743730878 abstract "The oxidation of hydroxylamine by nitric acid in the presence of technetium ions at temperatures above ~60°C is an autocatalytic process comprising an induction period and then a catalysed reaction involving HNO 2 , which has accumulated in the solution. Tc ions have no appreciable effect on the reaction rate, which is governed only by the nitric and nitrous acid oxidation reactions of hydroxylamine, but the presence of Tc ions does extend the initial induction period. The rate of hydroxylamine oxidation by HNO 3 in the presence of HNO 2 , that is, after the induction period, was found to be: -d[NH 3 OH + ]/dt = k[NH 3 OH + ][HNO 2 ][HNO 3 ] 3.5 where k = 120±10 l 4.5 mol -4.5 min -1 at T = 80°C, μ = 2 and [H + ] ≤ 2 M. Under these conditions, the reaction apparently has a high activation energy of 160-180 kJ mol -1 . At low temperatures (20-40°C) hydroxylamine is effectively stable in solutions of HNO 3 up to concentrations of ~2 M, whether or not Tc(VII) ions are present. Tc(V) was also observed to form at least one complex on reduction with excess hydroxylamine with an absorption maximum between 467 and 480 nm dependent on the solution acidity." @default.
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- W2743730878 date "2000-07-01" @default.
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- W2743730878 title "The oxidation of hydroxylamine by nitric and nitrous acids in the presence of technetium (VII)" @default.
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- W2743730878 doi "https://doi.org/10.1524/ract.2000.88.7.425" @default.
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