A General Scavenging Rate Constant for Reaction of Hydroxyl Radical with Organic Carbon in Atmospheric Waters

2013 ◽  
Vol 47 (15) ◽  
pp. 8196-8203 ◽  
Author(s):  
Takemitsu Arakaki ◽  
Cort Anastasio ◽  
Yukiko Kuroki ◽  
Hitomi Nakajima ◽  
Kouichirou Okada ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Hydroxyl Radical ◽  
Rate Constant ◽  
Atmospheric Waters

Radiolysis studies on the corrosion inhibitors 1 -hexyn-3-ol, cinnamonitrile, and 1,3-diethyl-2-thiourea

1995 ◽  
Vol 73 (12) ◽  
pp. 2137-2142 ◽  
Author(s):  
A.J. Elliot ◽  
M.P. Chenier ◽  
D.C. Ouellette
Keyword(s):  
Hydrogen Atom ◽  
Hydroxyl Radical ◽  
Temperature Dependence ◽  
Rate Constant ◽  
Rate Constants ◽  
Corrosion Inhibitors ◽  
Hydrated Electron

In this publication we report: (i) the rate constants for reaction of the hydrated electron with 1-hexyn-3-ol ((8.6 ± 0.3) × 108 dm3 mol−1 s−1 at 18 °C), cinnamonitrile ((2.3 ± 0.2) × 1010 dm3 mol−1 s−1 at 20 °C), and 1,3-diethyl-2-thiourea ((3.5 ± 0.3) × 108 dm3 mol−1 s−1 at 22 °C). For cinnamonitrile and diethylthiourea, the temperature dependence up to 200 °C and 150 °C, respectively, is also reported; (ii) the rate constants for the reaction of the hydroxyl radical with 1-hexyn-3-ol ((5.5 ± 0.5) × 109 dm3 mol−1 s−1 at 20 °C), cinnamonitrile ((9.2 ± 0.3) × 109 dm3 mol−1 s−1 at 21 °C), and diethylthiourea ((8.0 ± 0.8) × 108 dm3 mol−1 s−1 at 22 °C). For cinnamonitrile, the temperature dependence up to 200 °C is also reported; (iii) the rate constant for the hydrogen atom reacting with 1-hexyn-3-ol ((4.3 ± 0.4) × 109 dm3 mol−1 s−1 at 20 °C). Keywords: radiolysis, corrosion inhibitors, rate constants.

Multivariate QSARs to model the hydroxyl radical rate constant for halogenated aliphatic hydrocarbons

1994 ◽  
Vol 5 (2) ◽  
pp. 197-208 ◽  
Author(s):  
Lennart Eriksson ◽  
Stefan Rännar ◽  
Michael Sjöström ◽  
Joop L. M. Hermens
Keyword(s):  
Hydroxyl Radical ◽  
Rate Constant ◽  
Aliphatic Hydrocarbons

Multivariate modelling of the rate constant of the gas-phase reaction of haloalkanes with the hydroxyl radical

1991 ◽  
Vol 109-110 ◽  
pp. 307-325 ◽  
Author(s):  
Maria Livia Tosato ◽  
Claudio Chiorboli ◽  
Lennart Eriksson ◽  
Jorgen Jonsson
Keyword(s):  
Hydroxyl Radical ◽  
Gas Phase ◽  
Rate Constant ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Multivariate Modelling

scholarly journals Effect of biostimulation on biodegradation of dissolved organic carbon in biological filters

2012 ◽  
Vol 5 (1) ◽  
pp. 23-29
Author(s):  
K. Tihomirova ◽  
A. Briedis ◽  
J. Rubulis ◽  
T. Juhna
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Rate Constant ◽  
Strong Positive Correlation ◽  
Biodegradation Rate ◽  
Column System ◽  
Glass Column ◽  
Standard Solution ◽  
Biodegradable Dissolved Organic Carbon ◽  
Biological Filters

Abstract. The addition of labile organic carbon (LOC) to enhance the biodegradation rate of dissolved organic carbon (DOC) in biological columns was studied. Acetate standard solution (NaAc) and Luria Bertrani (LB) medium were used as LOC as biostimulants in glass column system used for measurements of biodegradable dissolved organic carbon (BDOC). The addition of LOC related with the increase of total DOC in sample. The concentration of BDOC increased up to 7 and 5 times and was utilized after 24 min. contact time. The biodegradation rate constant was increased at least 26 times during adaptation-biostimulation period. There was a strong positive correlation between the biodegradation rate constant and the concentration of BDOC. Biostimulation period ranged from 24 to 53 h for NaAc biostimulant and from 20 to 168 h for LB. The study has shown that LOC could be used as stimulator to enhance the biodegradation rate of DOC during biofiltration.

Conductometric Pulse Radiolysis Study on the Reaction of the Solvated Electron with 5-Bromouracil in Aqueous Solutions at Different pH Values

1974 ◽  
Vol 29 (1-2) ◽  
pp. 86-88b ◽  
Author(s):  
Burkhard O. Wagner ◽  
Herbert Klever ◽  
Dietrich Schulte-Frohlinde
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Atom ◽  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Rate Constant ◽  
Pulse Radiolysis ◽  
Solvated Electron ◽  
Ph Values

To study the reaction of the solvated electron with 5-bromouracil an aqueous solution has been examined by conductometric pulse radiolysis at pH values between 4.68 and 8.74. Alcohol was added to scavenge the hydrogen atom and the hydroxyl radical. G(Br—) = (2.64 ± 0.08)/100 eV was found to be independent of the pH. The mobility of the bromouracil mono-anion was measured to be (2.7 ± 0.2) 10-4 cm2 V-1 s-1 at 20°C, and the rate constant of reaction (3b) was determined to be k(H+ BrUr-) = (2.3 ± 0.2) 1010 I mole-1 s-1*.

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