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
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Journal ArticleDOI
A laboratory study of the oxidation of non toxic Cr(III) to toxic Cr(VI) by OH(•) free radicals in simulated atmospheric water droplets conditions: potential environmental impact.
Fathi Djouider,Ahmad Hussain +1 more
TL;DR: It is shown that the reaction was highly pH dependant with a maximum yield at pH 4.51×10(4)s(-1) and the implication of this oxidation to atmospheric chromium contamination is discussed.
Journal ArticleDOI
Oxidation of Tryptamine and 5-Hydroxytryptamine: A Pulse Radiolysis and Quantum Chemical Study
TL;DR: The reactions of oxidizing radicals (*)OH, N(3)(*), Br(2)(*-), and NO(2)* with tryptamine (Tpe) and 5-hydroxytryptamine (HTpe) were studied by pulse radiolysis and analyzed by quantum chemical calculations.
Reference EntryDOI
Radiation‐Induced Radical Reactions
TL;DR: In this paper, a brief summary of specific features of high-energy radiation and its interaction with matter is given as a base for better understanding of reaction mechanisms initiated by radiation in gases, liquids, and solids.
Journal ArticleDOI
Temperature dependence of the rate constant for the bimolecular recombination of Cl−2 in water—A pulse radiolysis study
TL;DR: The rate constant for the disproportionation of Cl−2 in water has been determined for the temperature range 22-87°C using pulse radiolysis of 0.1-M NaCl+1-mM HClO4 aqueous solution as mentioned in this paper.
Journal ArticleDOI
The Radiation Chemistry of the Cs-7SB Modifier used in Cs and Sr Solvent Extraction
Katy L. Swancutt,Thomas D. Cullen,Stephen P. Mezyk,Gracy Elias,William F. Bauer,R. Duane Ball,Dean R. Peterman,Catherine L. Riddle,Bruce J. Mincher,James J. Muller +9 more
TL;DR: In this paper, the behavior of the compound in irradiated solution, both in the presence and absence of a nitric acid aqueous phase was investigated using steady state and pulsed-radiolysis techniques.
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.