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C P R McCarter1, F Rezanezhad1, B Gharedaghloo2

  • 1Ecohydrology Research Group, Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave West, Waterloo, ON N2L 3G1, Canada.

Journal of Contaminant Hydrology
|May 19, 2019
PubMed
Summary
This summary is machine-generated.

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Chloride (Cl-) is not conservative in peat due to anion exclusion and adsorption, contrary to common assumptions. While anion exclusion increases with peat decomposition, its overall impact on transport is minimal.

Area of Science:

  • Peat hydrogeochemistry
  • Environmental chemistry
  • Soil science

Background:

  • Peat's dual-porosity and high organic matter create complex hydrogeochemical transport.
  • Prolonged tailing and early breakthrough in chloride (Cl-) breakthrough curves (BTCs) are observed.
  • The causes (diffusion, adsorption, anion exclusion) of these BTC anomalies are debated.

Purpose of the Study:

  • To determine if Cl- is truly conservative in peat.
  • To elucidate the mechanisms causing prolonged tailing and early 50% concentration breakthrough of Cl-.
  • To investigate the roles of diffusion, adsorption, and anion exclusion in Cl- transport.

Main Methods:

  • Fitting the mobile-immobile (MiM) dual-porosity model to BTCs of Cl- and deuterated water.
Keywords:
Breakthrough curveConservative tracerEquilibrium adsorptionPore structureSolute transport

Related Experiment Videos

  • Conducting equilibrium Cl- adsorption batch experiments.
  • Analyzing the influence of peat decomposition on anion exclusion and diffusion.

    • Main Results:

    • Cl- adsorption followed Freundlich isotherms, becoming negligible below ~310 mg L-1.
    • Dispersivity differed significantly between Cl- and deuterated water BTCs when adsorption was considered.
    • Anion exclusion increased with peat decomposition but did not affect diffusion into immobile pores.
    • No statistical differences in dispersivity or immobile water content were found between Cl- and deuterated water when accounting for anion exclusion.

    Conclusions:

    • Chloride (Cl-) is not conservative in peat, primarily due to anion exclusion and secondarily due to adsorption at higher concentrations.
    • Anion exclusion significantly increases with peat decomposition.
    • Despite anion exclusion, the overall effect on Cl- transport in peat is minimal.