Ionic strength and buffer effects in the elimination reaction of 1,1,2,2-tetrachloroethane

Ionic strength and buffer effects in the elimination reaction of 1,1,2,2-tetrachloroethane

The rate constant for the abiotic reaction of 1,1,2,2,-tetrachloroethane in aqueous solution has been studied as a function of ionic strength, buffer composition, temperature, and pH. The rate of reaction is found to be independent of ionic strength and buffer composition, with the parent compound q...

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Bibliographic Details
Published in:Water research (Oxford) Vol. 29; no. 8; pp. 1924 - 1928
Main Authors: Joens, Jeffrey A., Slifker, Rose A., Cadavid, Eva M., Martinez, Richard D., Nickelsen, Michael G., Cooper, William J.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 1995
Elsevier Science
Subjects:
2 tetrachloroethane
abiotic reaction
Brackish
Chemistry
chloroalkanes
dehydrohalogenation reaction
elimination reaction
Exact sciences and technology
Freshwater
Kinetics and mechanisms
Marine
Organic chemistry
Reactivity and mechanisms
dehydrohalogenation reaction
1
elimination reaction
2
abiotic reaction
chloroalkanes
2 tetrachloroethane
Ionic strength
Elimination
Arrhenius equation
Dissociation constant
Buffer system
Rate constant
Thermodynamic properties
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Summary:The rate constant for the abiotic reaction of 1,1,2,2,-tetrachloroethane in aqueous solution has been studied as a function of ionic strength, buffer composition, temperature, and pH. The rate of reaction is found to be independent of ionic strength and buffer composition, with the parent compound quantitatively converted into trichloroethene by a base mediated elimination reaction for values of pH > 3.5. The Arrhenius parameters for the elimination reaction are log 10 A = 16.32 ± 0.40; E a = 95.0 ± 2.5 kJ/mol. No evidence for a neutral hydrolysis reaction was found, indicating that the rate constant for such a reaction is <2 × 10 −7 s −1 at 90°C.
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ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(95)00012-A