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
Pulse radiolysis study on the estimation of radiolytic yields of water decomposition products in high-temperature and supercritical water: Use of methyl viologen as a scavenger
Mingzhang Lin,Yosuke Katsumura,Yusa Muroya,Hui He,Guozhong Wu,Zhenhui Han,Toyoaki Miyazaki,Hisaaki Kudo +7 more
TL;DR: In this paper, the radiolytic yields of water decomposition products from room temperature to 400 °C by pulse radiolysis method were estimated using a 0.5 mM MV2+ solution in the presence of 10 mM NaCOOH up to 200 °C.
Journal ArticleDOI
A pulse radiolysis investigation of the reactions of tributyl phosphate with the radical products of aqueous nitric acid irradiation.
TL;DR: Room temperature rate constants for the reactions of TBP and HDBP with the hydroxyl radical are determined and used to discuss the mechanism of T BP radical-induced degradation.
Journal ArticleDOI
Radical scavenging and catalytic activity of metal-phenolic complexes.
TL;DR: A series of metal-ligand complexes prepared by the reaction of various metal ions with phenolic derivatives of [catechol, chlorogenic acid, n-propyl gallate, 3-hydroxy anthranilic acid, resveratrol, and rutin] are characterized by UV-vis spectroscopy and the metal/ligand complexing ratio and complexation constants have been determined.
Journal ArticleDOI
OH-Radical-induced oxidation of methanesulfinic acid. The reactions of the methanesulfonyl radical in the absence and presence of dioxygen
Roman Flyunt,Roman Flyunt,Oksana Makogon,Man Nien Schuchmann,Klaus-Dieter Asmus,Clemens von Sonntag +5 more
TL;DR: In this article, a steady-state radiolysis of methanesulfinic acid was performed with conductometric detection and it was shown that CH3S(O)O˙ is formed in only ∼80% yield.
Journal ArticleDOI
Change of boron substitution improves the lasing performance of Bodipy dyes: a mechanistic rationalisation.
Krishna K. Jagtap,Neelam Shivran,Soumyaditya Mula,Devidas B. Naik,Sisir K. Sarkar,Tulsi Mukherjee,Dilip K. Maity,Alok K. Ray +7 more
TL;DR: The results of theoretical and pulse radiolysis studies revealed that the substitution at the boron centre reduced the (1)O(2) generation capacity of these dyes as well as their rate of reaction with (1), thereby enhancing their lifetimes even under lasing conditions.
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.