Authors: G.P. Home, T.A. Donoclift, H.E. Sims, R.M. Orr, S.M. Pimblott A multiscale modeling approach has been developed for the extended time scale long- term radiolysis of aqueous systems. The approach uses a combination of stochastic track structure and track chemistry as well as deterministic homogeneous chemistry techniques and involves four key stages: radiation track structure simulation, the subsequent physicochemical…
Authors: W. Wang, M. N. Schuchmann, Vinzens Bachler, H. Schuchmann, C. Sonntag Hydroxymethyl radical•CH2OH and its radical anion •CH2O- (pKa 10.7) were generated pulse-radiolytically in N2O-saturated aqueous solutions of methanol. The overall decay is by second-order kinetics. At pH ≤ 8 (•CH2OH, 2k = 1.7 × 109 dm3 mol-1 s-1), one observes ethylene glycol and formaldehyde plus methanol in a…
Authors: Z. D. Draganić, V. Niketić, S. Jovanović, I. G. Draganić Oxygen-free aqueous solutions of NH4CN (0.1 M, pH 9) were exposed to gamma rays from a60Co source, the mixture of nonvolatile products was fractionated, and the fractions were analyzed. The procedures were chosen to make effective investigations of radiolytic products, and to minimize the contributions of chemical changes which…
Authors: N. K. Kochetkov, L. I. Kudrjashov, M. A. Chlenov, L. P. Grineva The mechanism of the radiation-induced dephosphorylation reaction was investigated by studying the γ-radiolysis of 10mM solutions of D-glucopyranosyl phosphate, D-glucose 6-phosphate (Glc-6-P), and d-ribose 5-phosphate (Rib-5-P). Dephosphorylation occurred with OH-radical participation, since G(H3PO4) values for nitrous oxide-saturated solutions were 4.1, 1.7, and 2.3, and for nitrogen-saturated solutions…
Authors: T. W. Woodward, H. C. Sutton Aliphatic alcohols increase the yields of N2O observed in the radiolysis of NO solutions and are oxidized to the corresponding aldehyde in the process. The following reactions occur in addition to those previously suggested 1 for the NO radiolysis: OH+ROH → H2O+˙ROH ˙ROH+3NO → N2O+HNO2+R˙= 0(aldehyde) where R = Me, Et, i-Pr. https://doi.org/10.1039/TF9666200070
Authors: Lj. Josimović , I. Draganić The radiation chemical yields of stable products were measured in deaerated and oxygenated solutions at low absorbed doses(~<10 krad), different pH values(1-3 and 7.8) and various acetic acid concentrations(0’1-17mol dm-a). For a dilute solution(0″1mol dm-a) the results obtained support a simple reactions cheme.At larger acetic acid concentrations yields of stable products change proportionally to…