Kinetics of Technetium Reactions: XV. Tc(IV) Oxidation with Persulfate Ions in HClO4 Solution

Autor:	V. S. Koltunov, G. V. Koltunov, T. V. Gomonova
Rok vydání:	2005
Předmět:	Reaction rate Reaction rate constant Ionic strength Chemistry Thermal decomposition Inorganic chemistry Kinetics Activation energy Physical and Theoretical Chemistry Persulfate Ion
Zdroj:	Radiochemistry. 47:163-167
ISSN:	1608-3288 1066-3622
DOI:	10.1007/s11137-005-0065-y
Popis:	Tc(IV) is oxidized with persulfate ions in HClO4 solution by reactions with both S2O 8 2− ion and product of its thermal decomposition, Caro acid, H2SO5. The reaction rate at 35°C and solution ionic strength µ = 1 is described by the equation d[Tc(IV)]/dt = k 1[Tc(IV)][S2O 8 2− ] + k 3[Tc(IV)][HSO 5 − ]/[H+], where k 1 = 0.88±0.04 l mol−1 min−1 and k 3 = 110±5 min−1. With increasing ionic strength to µ = 2, both rate constants decrease (k 1 = 0.58±0.08 l mol−1 min−1 and k 3 = 52±2 min−1 at 35°C). The activation energy of the overall reaction is 77.7±8.1 kJ mol−1. The mechanisms of both reactions are discussed.
Databáze:	OpenAIRE
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