A DETAILED STUDY OF THE SAMUEL–MAGEE MODEL FOR THE RADIATION CHEMISTRY OF WATER: PART II. KINETICS OF RADICAL REACTIONS IN THE TRACKS OF DENSELY IONIZING PARTICLES

1960 ◽  
Vol 38 (1) ◽  
pp. 61-76 ◽  
Author(s):  
P. J. Dyne ◽  
J. M. Kennedy
Keyword(s):  
Liquid Water ◽  
Radical Pair ◽  
Electronic Computer ◽  
Radiation Chemistry ◽  
Track Density ◽  
Radical Reactions ◽  
Oh Radicals ◽  
Good Qualitative Agreement ◽  
Kinetics Of ◽  
Track Diameter

The kinetics of recombination of H and OH radicals, formed in liquid water along the track of a densely ionizing particle in the manner suggested by Samuel and Magee, have been studied using an electronic computer. The variation in yields with track density is in good qualitative agreement with experiment. Arguments are advanced to show that the energy required to produce one effective radical pair in liquid water is about 20 ev. Discussions are presented of the effects of scavenger concentration and its depletion at the center of the track, track diameter, the value of the rate constant for the recombination of H atoms and OH radicals, and the value of G(−H2O) as a function of track density

THE KINETICS OF RADICAL REACTIONS IN THE TRACKS OF FAST ELECTRONS. A DETAILED STUDY OF THE SAMUEL–MAGEE MODEL FOR THE RADIATION CHEMISTRY OF WATER

1958 ◽  
Vol 36 (11) ◽  
pp. 1518-1536 ◽  
Author(s):  
P. J. Dyne ◽  
J. M. Kennedy
Keyword(s):  
Molecular Hydrogen ◽  
Isotope Effects ◽  
Radiation Chemistry ◽  
Small Radius ◽  
Oh Radicals ◽  
Fast Electrons ◽  
Light Water ◽  
Diffusion Constants ◽  
Isotopic Separation ◽  
Kinetics Of

The kinetic behavior of a γ-ray spur produced in water, having H and OH radicals distributed spatially in the manner suggested by Samuel and Magee, has been studied using an electronic computer. The variation in yield of the molecular products H2, H2O2, and H2O with rate constants, diffusion constants, and spur size has been obtained. The model gives agreement with experiment choosing spurs with a small "radius" of the order of 10 Å. On simple assumptions, however, the model predicts no difference in the molecular yields between heavy and light water and no isotopic separation in the formation of molecular hydrogen from isotopically enriched light water. Various special assumptions needed to give agreement with experiment for these isotope effects are discussed. The observed isotopic separation in the formation of molecular hydrogen is attributed to the preferential dissociation of an H atom from an excited HDO molecule. It is found that the yield of molecular hydrogen is less sensitive to the presence of scavengers than the yield of hydrogen peroxide.

scholarly journals Kinetics of Microcystin-LR Removal in a Real Lake Water by UV/H2O2 Treatment and Analysis of Specific Energy Consumption

Toxins ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 810
Author(s):  
Sabrina Sorlini ◽  
Carlo Collivignarelli ◽  
Marco Carnevale Miino ◽  
Francesca Maria Caccamo ◽  
Maria Cristina Collivignarelli
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Lake Water ◽  
Harmful Effect ◽  
Specific Energy Consumption ◽  
World Health ◽  
Oh Radicals ◽  
H2o2 Treatment ◽  
Initial Concentration ◽  
Kinetics Of

The hepatotoxin microcystin-LR (MC-LR) represents one of the most toxic cyanotoxins for human health. Considering its harmful effect, the World Health Organization recommended a limit in drinking water (DW) of 1 µg L−1. Due to the ineffectiveness of conventional treatments present in DW treatment plants against MC-LR, advanced oxidation processes (AOPs) are gaining interest due to the high redox potential of the OH• radicals. In this work UV/H2O2 was applied to a real lake water to remove MC-LR. The kinetics of the UV/H2O2 were compared with those of UV and H2O2 showing the following result: UV/H2O2 > UV > H2O2. Within the range of H2O2 tested (0–0.9 mM), the results showed that H2O2 concentration and the removal kinetics followed an increasing quadratic relation. By increasing the initial concentration of H2O2, the consumption of oxidant also increased but, in terms of MC-LR degraded for H2O2 dosed, the removal efficiency decreased. As the initial MC-LR initial concentration increased, the removal kinetics increased up to a limit concentration (80 µg L−1) in which the presence of high amounts of the toxin slowed down the process. Operating with UV fluence lower than 950 mJ cm−2, UV alone minimized the specific energy consumption required. UV/H2O2 (0.3 mM) and UV/H2O2 (0.9 mM) were the most advantageous combination when operating with UV fluence of 950–1400 mJ cm−2 and higher than 1400 mJ cm−2, respectively.

scholarly journals Laboratory study on OH-initiated degradation kinetics of dehydroabietic acid

2015 ◽  
Vol 17 (16) ◽  
pp. 10953-10962 ◽  
Author(s):  
Chengyue Lai ◽  
Yongchun Liu ◽  
Jinzhu Ma ◽  
Qingxin Ma ◽  
Hong He
Keyword(s):  
Laboratory Study ◽  
Environmental Conditions ◽  
Degradation Kinetics ◽  
Dehydroabietic Acid ◽  
Oh Radicals ◽  
Kinetics Of

The degradation kinetics of dehydroabietic acid by OH radicals were investigated under various environmental conditions.

Atmospheric chemistry of trans-CF3CHCHCl: Kinetics of the gas-phase reactions with Cl atoms, OH radicals, and O3

2008 ◽  
Vol 199 (1) ◽  
pp. 92-97 ◽  
Author(s):  
M.P. Sulbaek Andersen ◽  
E.J.K. Nilsson ◽  
O.J. Nielsen ◽  
M.S. Johnson ◽  
M.D. Hurley ◽  
...  
Keyword(s):  
Gas Phase ◽  
Atmospheric Chemistry ◽  
Oh Radicals ◽  
Gas Phase Reactions ◽  
Kinetics Of ◽  
Cl Atoms

Kinetics of the reactions of O3and OH radicals with a series of dialkenes and trialkenes at 294 ± 2 K

1984 ◽  
Vol 16 (8) ◽  
pp. 967-976 ◽  
Author(s):  
Roger Atkinson ◽  
Sara M. Aschmann ◽  
William P. L. Carter
Keyword(s):  
Oh Radicals ◽  
Kinetics Of
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