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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Comparative study of p‐amino benzhydrazide and m‐amino benzhydrazide by free radicals and free electron transfer
TL;DR: In this article, the bimolecular electron transfer from p-amino benzhydrazide (PABH) and its meta-derivative (m-AMINO benzhydraside (MABH)) to specific one-electron oxidant results in the formation of anilino radical.
Journal ArticleDOI
Multiscale modelling of the radical-induced chemistry of acetohydroxamic acid in aqueous solution
TL;DR: In this paper , a multiscale computer model was proposed to predict the radical-induced degradation of AHA in acidic aqueous solutions, and the model predictions were critically evaluated by a systematic experimental radiation chemistry investigation, leveraging time-resolved electron pulse irradiation techniques for the measurement of new radical reaction rate coefficients, and steady-state gamma irradiations for the identification and quantification of degradation products: acetic acid, hydroxylamine, nitrous oxide, and molecular hydrogen, with formic acid and methane as minor products.
Journal ArticleDOI
Oxidation reactions of carbaryl in aqueous solutions
S R Nair,Sunil Paul M. Menacherry,Sanu Watson Renjith,T.K. Manojkumar,Usha K. Aravind,Charuvila T. Aravindakumar +5 more
TL;DR: In this paper , the reaction of ●OH with carbaryl resulted in a number of hydroxylated adduct radicals (λmax - 330 nm and 390 nm; k2 - 1.2 × 1010 dm3 mol-1 s-1).
Journal ArticleDOI
Carnosine induced formation of silver nanochains: A radiolytic study
TL;DR: In this article, the interaction of carnosine with silver clusters and its nanoparticles was studied at pH 8.2 and 9.2 using time resolved kinetic measurements, and the results suggest that silver nanochains get formed through dipole-dipole interaction due to weak interaction with carnosines.
Journal ArticleDOI
Time-dependent radiolytic yields at room temperature and temperature-dependent absorption spectra of the solvated electrons in polyols
TL;DR: In this paper, the molar extinction coefficients at the absorption maximum of the solvated electron spectrum have been evaluated to be 900, 970, and 1000 mol−1·m2 for 1,2-ethanediol (12ED), 1, 2-propanediol(12PD), and 1, 3-polypropediol (13PD), respectively.
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.