Soil-pH and cement influence the weathering kinetics of chrysotile asbestos in soils and its hydroxyl radical yield

2021 ◽  
pp. 128068
Author(s):  
Martin Walter ◽  
Gerald Geroldinger ◽  
Lars Gille ◽  
Stephan M. Kraemer ◽  
Walter D.C. Schenkeveld
Keyword(s):  
Hydroxyl Radical ◽  
Soil Ph ◽  
Chrysotile Asbestos ◽  
Kinetics Of ◽  
Radical Yield

Radical Formation in Ozone Reactions with Lignin and Carbohydrate Model Compounds

Holzforschung ◽  
1999 ◽  
Vol 53 (3) ◽  
pp. 292-298 ◽  
Author(s):  
M. Ragnar ◽  
T. Eriksson ◽  
T. Reitberger
Keyword(s):  
Hydroxyl Radical ◽  
Metal Ions ◽  
Ph Dependence ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model ◽  
Kinetics Of ◽  
Radical Yield ◽  
Ozone Reactions ◽  
Ozone Bleaching

Summary Using different independent methods, the kinetics of ozone consumption and the initial radical yield in reactions of ozone with lignin and carbohydrate model compounds were investigated. It was demonstrated that ozone reacts with phenolates several orders of magnitude more rapidly than with corresponding undissociated phenols. The pH dependence of the radical yield does not completely follow the pK a-value of the phenols. In fact, the radical yield starts to increase at pH 3 for all the phenolic model compounds investigated. Several indications suggest that superoxide rather than the hydroxyl radical is initially formed when ozone reacts with lignin model compounds. In contrast to lignin model compounds no radicals were detected in ozone reactions with carbohydrate model compounds or olefins. On the basis of this study, it may be concluded that ozone bleaching should preferably be performed at pH 3 and at a higher consistency. No significant effect of metal ions was observed.

Molecular structure effects on the kinetics of hydroxyl radical addition to azo dyes

2002 ◽  
Vol 15 (5) ◽  
pp. 287-292 ◽  
Author(s):  
Hugo Destaillats ◽  
Adrián G. Turjanski ◽  
Darío A. Estrin ◽  
Michael R. Hoffmann
Keyword(s):  
Molecular Structure ◽  
Hydroxyl Radical ◽  
Azo Dyes ◽  
Radical Addition ◽  
Kinetics Of

Kinetics of the Reaction of Methyl Radical with Hydroxyl Radical and Methanol Decomposition†

2007 ◽  
Vol 111 (19) ◽  
pp. 3932-3950 ◽  
Author(s):  
Ahren W. Jasper ◽  
Stephen J. Klippenstein ◽  
Lawrence B. Harding ◽  
Branko Ruscic
Keyword(s):  
Hydroxyl Radical ◽  
Methanol Decomposition ◽  
Methyl Radical ◽  
Kinetics Of

scholarly journals Kinetics of the bronchoalveolar leucocyte response in rats during exposure to equal airborne mass concentrations of quartz, chrysotile asbestos, or titanium dioxide.

Thorax ◽  
1988 ◽  
Vol 43 (7) ◽  
pp. 525-533 ◽  
Author(s):  
K Donaldson ◽  
R E Bolton ◽  
A Jones ◽  
G M Brown ◽  
M D Robertson ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Chrysotile Asbestos ◽  
Kinetics Of ◽  
Mass Concentrations

Kinetics of the reactions of the hydroxyl radical with xylenes

1981 ◽  
Vol 85 (20) ◽  
pp. 2913-2916 ◽  
Author(s):  
J. M. Nicovich ◽  
R. L. Thompson ◽  
A. R. Ravishankara
Keyword(s):  
Hydroxyl Radical ◽  
Kinetics Of
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