Iron reduction potential
There is sufficient need, therefore, for code a study that potential fully characterizes the reactivity of alkyl halide solvents in ZVI systems.
In addition to iron the aforementioned batch studies, studies iron investigating interspecies competition in systems with multiple alkyl halide species will be conducted to reduction gain insights into the reactivity of iron in complex mixtures of contaminants, a situation much more likely to be encountered in a contaminated.
In compounds of iron (where known the most common oxidation numbers of iron are: 3, and.
Such relationships will be constructed by comparing rate constants iron for alkyl halide reduction by iron to a variety of thermodynamic parameters such iron as carbon-halogen bond dissociation energies and the lowest unoccupied molecular orbital blanc energy levels for each species.Approach: To achieve the stated project goals, a series of batch studies will be performed to investigate the reactivity of more than 15 alkyl halide contaminants in ZVI systems.Results of this study will allow for better design and modeling of field-scale iron PRBs, while also providing the means blanc to develop predictive iron tools for alkyl halide reactivity in iron systems.Rate constants for alkyl halide reduction will be determined by applying a pseudo-first-order kinetic model to the concentration versus time data reduction obtained from all batch systems.Such predictive tools can be used by regulators to determine if iron PRB installation is the proper treatment approach for a given groundwater site contaminated mouche with such species.Supplemental Keywords: fellowship, halogenated solvents, groundwater, contaminants, alternative treatment, solvent plumes, permeable reactive potential barriers, PRBs, zero-valent iron, ZVI, alkyl halides, quantitative structure-activity relationships, qsars, remediation, groundwater treatment, Scientific Discipline, Waste, Remediation, Environmental Chemistry, Ecology and Ecosystems, Groundwater remediation, Environmental Engineering, carre energy conservation, predictive understanding, halogenated.For each compound, a formal oxidation number for iron is given, but the usefulness of this number is limited for p -block elements carre in particular.When necessary, gas chromatography with mass spectrometry detection (GC/MS) will be used to assist in the identification of product species.Institution: The Johns Hopkins University, ePA Project Officer: Packard, Benjamin H, project Period: January 1, 2004 through December 31, 2006.Unlike vinyl halides solvents that have garnered significant attention in both laboratory and field-scale research with ZVI, alkyl halide species, such as 1,2-dibromoethane and 1,1,1-trichloroethane, have received much less focus. None listed, travaux fluorides, chlorides, bromides, iodides.
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EPA Grant Number: FP916405, title: Mechanistic Investigations of dimpôts Alkyl Halide Contaminant Reduction by Iron.
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Gas chromatography with either flame ionization detection (GC/FID) or electron capture detection (GC/ECD) will be used impots to monitor both parent species decay and product species formation travaux in photobox batch systems.
Additional batch studies will be conducted with select alkyl travaux halides to assess those experimental factors reductions most influential to system reactivity.
Additional relationships will be developed by comparing rate constants for reduction in iron dimpôts systems to rate constants for these species measured with other reductants such impots as zero-valent zinc, Fe(II) porphyrin, and aqueous phase Cr(II) that are reported in the impots literature.Visit Stack Exchange, for questions about the pour reduction potential (A measure of the tendency of a chemical species to acquire electrons and thereby be reduced) or its applications.Potential factors to be investigated include the identity of the buffer employed in batch systems (Tris versus carbonate the initial pH of the reactor system, the mixing speed of batch systems, the effect of initial oxidant concentration, and the influence of varying the amount.In particular, the objectives of this current study are to determine the kinetic rate constants and to elucidate the reaction pathways and product species resulting from the reduction of alkyl halide solvents by ZVI.Project Amount: dimpôts 111,172, rFA: star Graduate Fellowships (2004 rFA Text, recipients Lists.Hydrides, the term hydride is used to indicate compounds of the type MxHy and not dimpôts necessarily to indicate that any fnac compounds listed behave as hydrides chemically.134 questions, filter by, no answers.In recent years, zero-valent iron (ZVI) permeable reactive barriers (PRBs) have emerged as an effective and cost-efficient treatment alternative for these and many other species of environmental concern.Given the differences in chemical structures between these two classes of organohalides (with vinyl halides possessing a -bond system in contrast to the fully saturated bond systems of alkyl halides it is possible that the behavior of these compound classes in iron systems will differ.