Journal ArticleDOI
Re-evaluation of the thiocyanate dosimeter for pulse radiolysis
George V. Buxton,Craig R. Stuart +1 more
TLDR
In this article, the super-Fricke dosimeter was used as a secondary standard for the thiocyanate dosimeter in O2-saturated water and the results were improved to 3.47 ± 0.06.Abstract:
The thiocyanate dosimeter (10–2 mol dm–3 SCN– in O2-saturated water) has been standardised against the super-Fricke dosimeter (10–2 mol dm–3 FeII in O2-saturated 0.4 mol dm–3 H2SO4) using the hexacyanoferrate(II) dosimeter [5 × 10–3 mol dm–3 Fe(CN)64– in O2-saturated water] as a secondary standard. On the basis that G(FeIII)= 1.67 × 10–6 mol J–1 and IµFeIII= 220.4 m2 mol–1 at 304 nm and 25 °C in the super-Fricke dosimeter, we obtain GIµ[Fe(CN)63–]=(3.47 ± 0.06)× 10–5 m2 J–1 at 420 nm and GIµ(SCN)2˙–=(2.59 ± 0.05)× 10–4 m2 J–1 at 475 nm. These values remain unchanged when the solutions are saturated with air instead of O2 and are doubled in N2O-saturated solution.read more
Citations
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Journal ArticleDOI
Evaluation of the stability constant of Cl2˙– in neutral aqueous solution
TL;DR: In this article, the stability constant (K1) of Cl2˙+ HCO2− was measured in neutral aqueous solution using pulse radiolysis to generate Cl˙ by reaction of SO4˙− with Cl− and was found to be (4.7 ± 0.4)× 103 dm3 mol-1 s−1 compared with the literature value of 1.9 × 105 dm 3 mol−1.
Journal ArticleDOI
Radiation chemistry of aqueous solutions of hydrazine at elevated temperatures . part 2. solutions containing oxygen
George V. Buxton,Craig R. Stuart +1 more
TL;DR: In this article, the authors measured the rate of reaction for pulse radiolysis up to 110°C in aqueous solutions ofHydrazine having a pH of 10.3 at room temperature.
Journal ArticleDOI
Methionine residue acts as a prooxidant in the •OH-induced oxidation of enkephalins.
Olivier Mozziconacci,Jacek Mirkowski,Filippo Rusconi,Filippo Rusconi,Gabriel Kciuk,Pawel Wisniowski,Krzysztof Bobrowski,Chantal Houée-Levin +7 more
TL;DR: The reactions of (•)OH radicals toward these peptides are reinvestigated in order to elucidate the oxidation mechanisms and the final products.
Journal ArticleDOI
H2O2-driven reduction of the Fe3+-quin2 chelate and the subsequent formation of oxidizing species.
TL;DR: The main conclusions from this study are that the reduction of Fe3+-quin2 can be driven by H2O2 and that Fe2+ in the following oxidation step produces a species indistinguishable from free hydroxyl radical.
Journal ArticleDOI
Pulse radiolysis of sodium formate aqueous solution up to 400 °C: Absorption spectra, kinetics and yield of carboxyl radical CO2−
Mingzhang Lin,Yosuke Katsumura,Yosuke Katsumura,Yusa Muroya,Hui He,Toyoaki Miyazaki,Daisuke Hiroishi +6 more
TL;DR: In this article, the second-order decay of CO 2 − is not monotonically temperature-dependent: the rate constant (2 k / e ) slightly increases with temperature up to 200 °C, then decreases to a valley at 300 °c, and it sharply increases again for temperature > 350 Â c.
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Yield for the scavenging of hydroxyl radicals in the radiolysis of nitrous oxide-saturated aqueous solutions
TL;DR: In this article, the thiocyanate dosimeter was calibrated against the Fricke system to obtain a value of 46,400 +-600 (molecules/100 eV) for the product of yield and extinction coefficient of (SCN)/sub 2/O-saturated solutions.
Journal ArticleDOI
Track effects in radiation chemistry. Concentration dependence for the scavenging of hydroxyl by ferrocyanide in nitrous oxide-saturated aqueous solutions
TL;DR: In this paper, the radiation chemical yield for oxidation of ferrocyanide by OH produced in the fast electron radiolysis of N/sub 2/O-saturated aqueous solutions was found to increase from a low concentration limiting yield of 5.2 to values in excess of 6.7.