Transverse Hydrodynamic Dispersion Effects on Isotope Signals in Groundwater Chlorinated Solvents' Plumes

Boris M. Van Breukelen, Massimo Rolle

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effects of transverse hydrodynamic dispersion on altering transformation induced compound specific isotope analysis (CSIA) signals within groundwater pollution plumes have been assessed with reactive transport modeling accommodating diffusion-induced isotope fractionation (DIF) and implementing different parameterizations of local transverse dispersion. The model reproduced previously published field data showing a negative carbon isotope pattern (-2 parts per thousand) at the fringes of a nondegrading PCE plume. We extended the study to reactive transport scenarios considering vinyl chloride as a model compound and assessing, through a detailed sensitivity analysis, the coupled effects of transverse hydrodynamic dispersion (with and without DIF) and aerobic fringe degradation on the evolution of carbon and chloride isotope ratios. Transformation induced positive isotope signals were increasingly attenuated with distance from the source and higher degradation rate. The effect of DIF on the overall isotope signal attenuation was greatest near the source and for low values of groundwater flow velocity, transverse dispersion coefficient, molecular weight, rate constant, and isotope fractionation factor, alpha, of the degradation reaction. Models disregarding DIF underestimate the actual alpha. The approximately twice larger DIF effect for chlorine than for carbon together with the low alpha for oxidation resulted in strong chlorine CSIA depletions for VC at the plume fringe.
Original languageEnglish
JournalEnvironmental Science & Technology (Washington)
Volume46
Issue number14
Pages (from-to)7700-7708
Number of pages9
ISSN0013-936X
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Chemistry (all)
  • Environmental Chemistry
  • Carbon isotopes
  • Chlorinated solvent
  • Compound-specific isotope analysis
  • Coupled effect
  • Degradation rate
  • Degradation reaction
  • Field data
  • Hydrodynamic dispersions
  • Isotope fractionation
  • Isotope ratio
  • Model compound
  • Parameterizations
  • Plume fringes
  • Reactive transport
  • Reactive transport modeling
  • Signal attenuation
  • Transverse dispersion
  • Vinyl chlorides
  • Carbon
  • Chlorine
  • Chlorine compounds
  • Degradation
  • Dispersions
  • Groundwater
  • Groundwater flow
  • Groundwater pollution
  • Hydrodynamics
  • Rate constants
  • Signal processing
  • Isotopes
  • ground water
  • isotope
  • vinyl chloride
  • carbon isotope
  • chloride
  • degradation
  • dispersion
  • flow modeling
  • flow velocity
  • groundwater flow
  • groundwater pollution
  • hydrodynamics
  • isotopic fractionation
  • isotopic ratio
  • oxidation
  • parameterization
  • plume
  • pollutant transport
  • solvent
  • transformation
  • aerobic metabolism
  • article
  • biodegradation
  • chlorination
  • fractionation
  • isotope analysis
  • molecular weight
  • sensitivity analysis
  • signal transduction
  • transverse hydrodynamic dispersion
  • water pollution
  • Biodegradation, Environmental
  • Canada
  • Carbon Isotopes
  • Chemical Fractionation
  • Computer Simulation
  • Diffusion
  • Halogenation
  • Models, Chemical
  • Polyvinyl Chloride
  • Reproducibility of Results
  • Solvents
  • 9002-86-2 Polyvinyl Chloride
  • degradation rate
  • groundwater flow velocity
  • groundwater pollution plume
  • isotope fractionation factor
  • carbon 7440-44-0 pollutant, water pollutant
  • chloride 16887-00-6 pollutant, water pollutant
  • vinyl chloride 75-01-4
  • 04500, Mathematical biology and statistical methods
  • 10060, Biochemistry studies - General
  • 10515, Biophysics - Biocybernetics
  • 37015, Public health - Air, water and soil pollution
  • Computational Biology
  • compound specific isotope analysis CSIA mathematical and computer techniques
  • diffusion-induced isotope fractionation modeling mathematical and computer techniques
  • hydrodynamic dispersion isotope fractionation model HDIF mathematical and computer techniques
  • reactive transport model mathematical and computer techniques
  • Models and Simulations
  • Pollution Assessment Control and Management
  • ENGINEERING,
  • ENVIRONMENTAL
  • LANDFILL LEACHATE PLUME
  • ORGANIC CONTAMINANTS
  • BIOAVAILABILITY RESTRICTIONS
  • REDUCTIVE DECHLORINATION
  • BIOGEOCHEMICAL PROCESSES
  • PETROLEUM-HYDROCARBONS
  • RAYLEIGH EQUATION
  • UNSATURATED ZONE
  • SANDY AQUIFERS
  • FRACTIONATION
  • PLUMES (Fluid dynamics)
  • Analysis

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