Relative rate constants for the reaction of OH radicals with selected C6 and C7 alkanes and alkenes at 305 ± 2 K

1976 ◽  
Vol 44 (3) ◽  
pp. 415-418 ◽  
Author(s):  
Karen R. Darnall ◽  
Arthur M. Winer ◽  
Alan C. Lloyd ◽  
James N. Pitts
Keyword(s):  
Rate Constants ◽  
Relative Rate ◽  
Oh Radicals ◽  
Relative Rate Constants

Absolute and relative rate constants for the gas-phase reaction of OH radicals with CH3NO2, CD3NO2 and CH3CH2CH3 at 295 K and 1 ATM

1988 ◽  
Vol 146 (3-4) ◽  
pp. 197-203 ◽  
Author(s):  
Ole J. Nielsen ◽  
Howard W. Sidebottom ◽  
Denis J. O'Farrell ◽  
Michael Donlon ◽  
Jack Treacy
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Relative Rate ◽  
Oh Radicals ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Relative Rate Constants

Specific Rate Constants of Hydroxyl Radical and Hydrated Electron Reactions Determined by the RCL Method

1976 ◽  
Vol 31 (11) ◽  
pp. 1501-1510 ◽  
Author(s):  
W. A. Prütz ◽  
S. Vogel
Keyword(s):  
Rate Constants ◽  
Relative Rate ◽  
Published Data ◽  
Oh Radicals ◽  
Specific Rate ◽  
Oh Radical ◽  
X Irradiation ◽  
Relative Rate Constants ◽  
Pseudo Halides ◽  
Common Application

Relative rate constants of OH radical and eaq- reactions have been determined by comparing, under steady x-irradiation, the effect of various solutes upon the radiationinduced chemiluminescence (RCL) of aqueous dye (DH) solutions, [DH + ·OH] + eaq- → DH* + OH-. The results abundantly confirm other published data. RCL changes upon addition of phosphates indicate prototropic reactions with the oxidized dye, D·+ H2PO4- ⇌ DH·+ + HPO42-, promoting or inhibiting the formation of semioxidized dye (DH·+) as the most efficient RCL precursor. The RCL enhancement commonly observed upon addition of halides and pseudo halides is discussed at some length on the base of previous and present results in order to focus attention to the possible correlation between such RCL enhancement and the effect of halogen-sensitization in radiobiology. RCL results suggest that the halide transients formed from OH radicals, X- + ·OH → X· + OH-, are very powerful oxidizing agents reacting with aromatics by electron-abstraction rather than by addition or H-abstraction. The common application of I- and SCN- as competitors for the estimation of OH radical reactivities is being commented in the context

scholarly journals OH initiated heterogeneous oxidation of tris-2-butoxyethyl phosphate: implications for its fate in the atmosphere

2014 ◽  
Vol 14 (13) ◽  
pp. 19431-19468
Author(s):  
Y. Liu ◽  
L. Huang ◽  
S.-M. Li ◽  
T. Harner ◽  
J. Liggio
Keyword(s):  
Rate Constants ◽  
Heterogeneous Reaction ◽  
Relative Rate ◽  
Oh Radicals ◽  
Particle Phase ◽  
Heterogeneous Oxidation ◽  
Flight Mass Spectrometry ◽  
Particle Mixing ◽  
Relative Rate Constants ◽  
Organic Particles

Abstract. A particle-phase relative rates technique is used to investigate the heterogeneous reaction between OH radicals and tris-2-butoxyethyl phosphate (TBEP) at 298 K by combining Aerosol Time-of-Flight Mass Spectrometry (C-ToF-MS) data and Positive Matrix Factor (PMF) analysis. The derived second-order rate constants (k2) for the heterogeneous loss of TBEP is (4.44 ± 0.45) × 10−12 cm3 molecule−1 s−1, from which an approximate particle-phase lifetime was estimated to be 2.6 (2.2–2.9) days. However, large differences in the relative rate constants for TBEP to a reference compound were observed when comparing internally and externally mixed TBEP/organic particles, and upon changes in the RH. The heterogeneous degradation of TBEP was found to be depressed or enhanced depending upon the particle mixing state and phase, highlighting the complexity of heterogeneous oxidation in the atmosphere. The effect of gas-particle partitioning on the estimated overall lifetime (gas + particle) for several organophosphate esters (OPEs) was also examined through the explicit modeling of this process. The overall atmospheric lifetimes of TBEP, tris-2-ethylhexyl phosphate (TEHP) and tris-1,3-dichloro-2-propyl phosphate (TDCPP) were estimated to be 1.9, 1.9 and 2.4 days respectively, and are highly dependent upon particle size. These results demonstrate that modeling the atmospheric fate of particle phase toxic compounds for the purpose of risk assessment must include the gas-particle partitioning process, and in future include the effect of other PM components on the evaporation kinetics and/or the heterogeneous loss rates.

Kinetics of the successive chlorination of 1,2-dichloroethane in the liquid phase

1969 ◽  
Vol 22 (6) ◽  
pp. 1177 ◽  
Author(s):  
DS Caines ◽  
RB Paton ◽  
DA Williams ◽  
PR Wilkinson
Keyword(s):  
Liquid Phase ◽  
Rate Constants ◽  
Relative Rate ◽  
Stirred Tank ◽  
Continuous Stirred Tank Reactor ◽  
Alternative Pathways ◽  
Tank Reactor ◽  
Relative Rate Constants ◽  
Continuous Stirred Tank ◽  
Kinetics Of

Liquid 1,2-dichloroethane has been chlorinated by dissolved chlorine to a succession of chloroethanes up to the ultimate hexachloroethane. The results of both batch and continuous stirred tank reactor systems have been analysed by computer techniques to give a set of relative rate constants from which one can predict the product composition for a given chlorine uptake, the aim in this work being to optimize the production of tetrachloroethanes. An unusual feature of the kinetics is that 1,1,1,2- and 1,1,2,2-tetrachloroethanes provide alternative pathways between 1,1,2-trichloroethane and pentachloroethane.

RECOMBINATION OF OPPOSITELY CHARGED AQUEOUS CLUSTER IONS USING ELECTROSTATICALLY MERGED ION BEAMS

1996 ◽  
Vol 03 (01) ◽  
pp. 655-660 ◽  
Author(s):  
B. PLASTRIDGE ◽  
K.A. COWEN ◽  
D.A. WOOD ◽  
M.H. COHEN ◽  
J.V. COE
Keyword(s):  
Rate Constants ◽  
Cluster Size ◽  
Collision Energy ◽  
Relative Rate ◽  
Center Of Mass ◽  
Cluster Ions ◽  
Charged Cluster ◽  
Relative Rate Constants ◽  
Oppositely Charged ◽  
Electrostatic Quadrupole

A new method for studying cluster-cluster interactions is introduced which involves merging mass-selected beams of oppositely charged cluster ions with an electrostatic quadrupole deflector. Recombination is monitored by measuring the rate of fast neutral production. Relative rate constants have been measured for the reaction of H 3O+( H 2 O )n+ OH −( H 2 O )m as a function of cluster size (m=n=0–3), which display a pronounced enhancement with clustering. Relative rate constants have also been measured as a function of center-of-mass collision energy for a heavily clustered reaction (n=3, m=3) and a lightly clustered reaction (n=1, m=0) revealing that clustering produces a dramatic change in the reaction mechanism.

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