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Hunkeler, Daniel
Nom
Hunkeler, Daniel
Affiliation principale
Fonction
Professeur ordinaire
Email
daniel.hunkeler@unine.ch
Identifiants
Résultat de la recherche
Voici les éléments 1 - 10 sur 188
- PublicationMétadonnées seulementComplementing approaches to demonstrate chlorinated solvent biodegradation in a complex pollution plume: Mass balance, PCR and compound-specific stable isotope analysis(2011)
;Courbet, C. ;Rivière, A. ;Jeannottat, S. ;Rinaldi, S.; ;Bendjoudi, H.De Marsily, G. - PublicationMétadonnées seulementCarbon isotopes as a tool to evaluate the origin and fate of vinyl chloride: Laboratory experiments and modeling of isotope evolution(2002)
; ;Aravena, RamonCox, EvanAccumulation of vinyl chloride (VC) is often a main concern at sites contaminated with chlorinated ethenes and ethanes due to its high toxicity. Since there can be several possible sources of VC and ethene at such sites, assessing the origin and fate of VC can be complicated. Aim of this study was to evaluate carbon isotope fractionation associated with various anaerobic processes that lead to the production of VC and ethene in view of using isotopes to evaluate the origin and fate of these compounds in groundwater. Microcosms were constructed using sediments and groundwater from a contaminated site and amended with potential precursors for VC and ethene production. In the microcosms with dichloroethene isomers, sequential reductive dechlorination was observed, and isotopic enrichment factors of -19.9+/-1.5%,for cis- 1,2-dichloroethene -30.3+/-1.9%o for trans-1,2-dichloroethene, and -7.3+/-0.4%o for 1,1,1-dichloroethene were obtained. In microcosms with chlorinated ethanes, 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethane (1,1,2-TCA) were predominantly transformed by dichloroelimination to ethene and VC, respectively, and enrichment factors of -32.1+/-1.1%o for 1,2-DCA and -2.0+/-0.2%o for 1,1,2-TCA were observed. Except for 1,1,2-TCA, a strong C-13 enrichment in each of the potential precursor of VC was observed, which opens the possibility to trace the origin of VC based on the isotope ratio of potential precursors, Furthermore, it was possible to model the isotope evolution of VC present as substrate or intermediate product as a function of time. The study demonstrates that carbon isotope ratios can potentially be used for qualitative and possibly quantitative evaluation of the origin and fate of VC at sites with complex contaminant mixtures. - PublicationMétadonnées seulementBiodegradation of organic pollutants and molecular identification of responsible microorganisms in several European river basins(2005)
;De Weert, Jasperien ;Van der Zaan, Bas ;Gerritse, Jan ;Langenhoff, Alette ;Tas, Neslihan ;Van Eekert, Miriam ;Schraa, Gosse ;Smidt, Hauke ;Albrechtsen, Hans-Jorgen ;Morasch, Barbara ;Hoenener, Patrick - PublicationMétadonnées seulement
- PublicationMétadonnées seulement
- PublicationMétadonnées seulementQuantification of biodegradation for o-xylene and naphthalene using first order decay models, Michaelis-Menten kinetics and stable carbon isotopes(2009)
;Blum, P.; ;Weede, M. ;Beyer, C. ;Grathwohl, P.Morasch, B. - PublicationMétadonnées seulement
- PublicationMétadonnées seulementA new concept linking observable stable isotope fractionation to transformation pathways of organic pollutants(2005)
;Elsner, M. ;Zwank, L.; Schwarzenbach, R. P. - PublicationMétadonnées seulementQuantification of biodegradation for various organic compounds using first-order, Michaelis-Menten kinetics and stable carbon isotopes(Vienna: EGU General Assembly, 2007)
;Blum, Philipp; ;Weede, Matthias ;Beyer, Christof ;Grathwohl, PeterMorasch, Barbara - PublicationMétadonnées seulementQuantification of sequential chlorinated ethene degradation by use of a reactive transport model incorporating isotope fractionation(2005)
;Van Breukelen, B. M.; Volkering, F.