Results 161 to 170 of about 594 (190)

Dechlorination of chlorinated ethenes and acetylenes by palladized iron

Environmental Technology, 2003
The degradation of chlorinated ethenes and acetylenes by palladium coated iron was studied in batch experiments. The reactivity of palladium coated iron with tetrachloroethene and its less chlorinated ethene and acetylene derivatives showed that dechlorination rates increased as the number of chlorines decreased.
Y H, Kim, E R, Carraway
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The coadsorption of ethene and chlorine on Ag(100)

Journal of Electron Spectroscopy and Related Phenomena, 1993
Abstract We have characterised the low temperature adsorption of ethene on both clean and chlorine-precovered Ag(100) surfaces. On the clean surface at temperatures ca. 100 K ethene is found to be weakly π-bonded at all coverages with dynamic pressures of the gas being required to saturate the monolayer adsorption state. At high coverages, around the
D.A. Slater, P. Hollins, M.A. Chesters
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Oxidation of chlorinated ethenes by potassium permanganate: a kinetics study

Journal of Hazardous Materials, 2001
The kinetics of oxidation of perchloroethylene (PCE), trichloroethylene (TCE), three isomers of dichloroethylene (DCE) and vinyl chloride (VC) by potassium permanganate (KMnO(4)) were studied in phosphate-buffered solutions of pH 7 and ionic strength approximately 0.05 M and under isothermal, completely mixed and zero headspace conditions. Experimental
K C, Huang, G E, Hoag, P, Chheda, B A, Woody, G M, Dobbs   +4 more
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Formation and detoxification of reactive intermediates in the metabolism of chlorinated ethenes

Journal of Biotechnology, 2001
Short-chain halogenated aliphatics, such as chlorinated ethenes, constitute a large group of priority pollutants. This paper gives an overview on the chemical and physical properties of chlorinated aliphatics that are critical in determining their toxicological characteristics and recalcitrance to biodegradation.
J E, van Hylckama Vlieg, D B, Janssen
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Chlorine Isotope Fractionation during Reductive Dechlorination of Chlorinated Ethenes by Anaerobic Bacteria

Environmental Science & Technology, 2002
Chlorine isotope fractionation during reductive dechlorination of trichloroethene (TCE) and tetrachloroethene (PCE) to cis-1,2-dichloroethene (cDCE) by anaerobic bacteria was investigated. The changes in the 37Cl/35Cl ratio observed during the one-step reaction (TCE to cDCE) can be explained by the regioselective elimination of chlorine accompanied by ...
Masahiko, Numata, Noboru, Nakamura, Hiromoto, Koshikawa, Yutaka, Terashima   +3 more
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Science and Policy in Risk Assessments of Chlorinated Ethenes

Annals of the New York Academy of Sciences, 2006
Abstract:  In this article the use of data obtained from standardized experimental methods, for example, as specified in OECD guidelines for the testing of chemicals, epidemiology data, and mechanism data obtained from nonstandardized experimental methods in carcinogen risk assessment is scrutinized using the most recent risk assessments made by ...
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Impact of Chlorofluorocarbon 113 on Chlorinated Ethene Biodegradation

Bioremediation Journal, 2004
The inhibition of tetrachloroethene (PCE) degradation in anaerobic, ethanol-fed PCE-enrichment cultures by chlorofluorocarbon 113 (CFC113) was a function of the initial CFC113 concentration. Typically, aqueous CFC113 concentrations up to 1 mg/L slowed, but did not stop PCE-degradation, but cis-1,2-dichloroethene (cDCE) degradation was inhibited by 0.2 ...
David Bagley, Ian Sutherland, Brent Sleep   +2 more
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The anaerobic microbiology and biotreatment of chlorinated ethenes

Current Opinion in Biotechnology, 1995
Abstract Reductive dechlorination is a promising process for the bioremediation of the ubiquitous groundwater contaminants tetrachloroethene and trichloroethene. Newly isolated anaerobic bacteria dechlorinating tetra- and trichloroethene to cis-1,2-dichloroethene in a respiratory process offer exciting insight into the microbiology involved. In order
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Effect of Hydrogen on Reductive Dechlorination of Chlorinated Ethenes

Environmental Science & Technology, 1997
A methanogenic fluidized bed reactor (FBR) fed with lactate and tetrachloroethene (PCE) was operated for 14 months to study the effect of electron donor and PCE loading on chloroethene dechlorination rates. Lactate was fed continu ously at 200 mg/L (2.2 mmol/L), and the influent PCE feed concentration was increased stepwise from 3.5 to 160 μmol/L ...
Bhaskar S. Ballapragada, H. David Stensel, J. A. Puhakka, John F. Ferguson   +3 more
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Chlorinated Ethenes from Groundwater in Tree Trunks

Environmental Science & Technology, 1998
The purpose of this investigation was to determine whether tree-core analysis could be used to delineate shallow groundwater contamination by chlorinated ethenes. Analysis of tree cores from bald cypress [Taxodium distichum (L.) Rich], tupelo (Nyssa aquatica L.), sweet gum (Liquidambar stryaciflua L.), oak (Quercus spp.), sycamore (Platanus ...
Don A. Vroblesky, Christopher T. Nietch, James T. Morris   +2 more
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