title: Stable carbon isotope fractionation during trichloroethene degradation in magnetite-catalyzed Fenton-like reaction.
abstract: Mineral-catalyzed Fenton-like oxidation of chlorinated ethylenes is an attractive technique for in situ soil and groundwater remediation. Stable carbon isotope enrichment factors associated with magnetite-catalyzed Fenton-like oxidation of trichloroethylene (TCE) have been determined, to study the possibility of applying stable carbon isotope analysis as a technique to assess the efficacy of remediation implemented by Fenton-like oxidation. The carbon enrichment factors (ε values) ranged from -2.7‰ to -3.6‰ with a mean value of -3.3±0.3‰, and only small differences were observed for different initial reactive conditions. The ε values were robust and reproducible, and were relatively insensitive to a number of environmental factors such as ratios of reactants and PCE co-contamination, which can reduce the uncertainty associated with application of isotope enrichment factors for quantification of in situ remediation by Fenton-like reaction. ε values for Fenton-like oxidation of TCE were intermediate in those previously reported for aerobic biological processes (ε=-1.1 to -20.7‰). Thus, field-derived ε values that are more negative than those for Fenton-like oxidation, may indicate the occurrence of aerobic biodegradation at contaminated sites undergoing in situ remediation with Fenton-like reaction. However, stable carbon isotope analysis is unable to determine whether there is the occurrence of biodegradation processes if field-derived ε values are less negative than those for Fenton-like oxidation.
authors.affiliation: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China. lydcn84@126.com
authors.forename: Yunde
authors.initials: Y
authors.lastname: Liu
authors.forename: Aiguo
authors.initials: A
authors.lastname: Zhou
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Gan
authors.forename: Cunfu
authors.initials: C
authors.lastname: Liu
authors.forename: Tingting
authors.initials: T
authors.lastname: Yu
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Li
mesh_terms: D001673:Biodegradation, Environmental; D002247:Carbon Isotopes / Q000737:chemistry*; D002384:Catalysis; D005591:Chemical Fractionation; D052918:Environmental Restoration and Remediation / Q000379:methods; D010084:Oxidation-Reduction; D014241:Trichloroethylene / Q000737:chemistry* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D014874:Water Pollutants, Chemical; D014241:Trichloroethylene