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
More filters
Journal ArticleDOI
Oxidation of tetrahydrobiopterin by biological radicals and scavenging of the trihydrobiopterin radical by ascorbate.
TL;DR: At physiological pH the pterin rapidly scavenges a range of biological oxidants often associated with cellular oxidative stress and nitric oxide synthase (NOS) dysfunction including hydroxyl ((*)OH), nitrogen dioxide (NO), glutathione thiyl (GS(*)), and carbonate (CO(3)(*-)) radicals.
Journal ArticleDOI
Kinetics and mechanisms of sulfate radical oxidation of β-lactam antibiotics in water.
TL;DR: The reaction rate constants for the sulfate radical with a large library of β-lactam antibiotics are determined to support the potential use of sulfateradical based AO/RPs for antibiotic activity removal.
Journal ArticleDOI
Ionic Liquids: Novel Media for Characterization of Radical Ions
TL;DR: In this paper, the application of ionic liquids as media for radiolytic generation and UV−vis−NIR spectroscopic characterization of radical ions is described, and the redox properties of neat 1-butyl-3-methylimidazolium salts and their aqueous solutions have been investigated by means of pulse radiolysis.
Journal ArticleDOI
Quantitative correlation of absolute hydroxyl radical rate constants with non-isolated effluent organic matter bulk properties in water
TL;DR: The obtained data were used to model steady state *OH concentrations during UV advanced oxidation, indicating that accurate measurement of reaction rate constants at specific sites would greatly improve the design and prediction of the removal of organic contaminants.
Journal ArticleDOI
Revealing the Nature of Trapping Sites in Nanocrystalline Titanium Dioxide by Selective Surface Modification
Nada M. Dimitrijevic,Zoran Šaponjić,David M. Bartels,Marion C. Thurnauer,David M. Tiede,Tijana Rajh +5 more
TL;DR: In this article, electron-beam pulse radiolysis was used to study excess electrons in nanocrystalline TiO{sub 2} nanoparticles and showed that dopamine-capped nanoparticles showed two preferential optical transitions with energies in the visible region.
References
More filters
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.