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Titolo:
Carbon isotope fractionation during microbial dechlorination of trichloroethene, cis-1,2-dichloroethene, and vinyl chloride: Implications for assessment of natural attenuation
Autore:
Bloom, Y; Aravena, R; Hunkeler, D; Edwards, E; Frape, SK;
Indirizzi:
Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ WaterlooWaterloo ON Canada N2L 3G1 ci, Waterloo, ON N2L 3G1, Canada Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada UnivToronto Toronto ON Canada M5S 3E5 Chem, Toronto, ON M5S 3E5, Canada
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 13, volume: 34, anno: 2000,
pagine: 2768 - 2772
SICI:
0013-936X(20000701)34:13<2768:CIFDMD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
HENRYS LAW CONSTANTS; REDUCTIVE DECHLORINATION; METHANOGENIC CONDITIONS; ANAEROBIC DEGRADATION; TETRACHLOROETHYLENE; DENITRIFICATION; MICROORGANISMS; SEDIMENT; AQUIFER; RATIOS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Aravena, R Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 o, ON N2L 3G1, Canada
Citazione:
Y. Bloom et al., "Carbon isotope fractionation during microbial dechlorination of trichloroethene, cis-1,2-dichloroethene, and vinyl chloride: Implications for assessment of natural attenuation", ENV SCI TEC, 34(13), 2000, pp. 2768-2772

Abstract

Carbon isotope fractionation during dechlorination of chlorinated ethenes was investigated using a methanogenic microbial enrichment culture. Subcultures were amended with trichloroethene (TCE), cis-1,2-dichloroethene ( cis-DCE), and vinyl chloride (VC), respectively. Carbon isotope ratios and concentrations of reactants and of all dechlorination products were monitored during two experiments. All dechlorination steps were accompanied by significant isotope fractionation. The isotope ratios of the reactants were described with a Rayleigh type model, and the following enrichment factors (epsilon(P/R)) were obtained: -6.6 and -2.5% for dechlorinationof TCE, -14.1 and -16.1% for dechlorination of cis-DCE, and -26.6 and -21.5% for dechlorination of VC. isotope and mass balances suggested that ethene (ETH) was degraded. In additional experiments with ETH as reactant, ETH became enriched in C-13 as its concentration decreased indicating the cultures were capable of degrading ETH. The average value for the enrichment factor obtained for thedegradation of ETH was -3.0%. The large carbon isotope fractionation observed in this study confirms that carbon isotope ratios are a sensitive tool for monitoring dechlorination of chlorinated ethenes to nontoxic end products.

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Documento generato il 05/07/20 alle ore 13:16:10