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This article in JEQ

  1. Vol. 31 No. 2, p. 506-514
     
    Received: June 26, 2000


    * Corresponding author(s): k.-h.herrmann@fz-juelich.de
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doi:10.2134/jeq2002.5060

Three-Dimensional Nickel Ion Transport through Porous Media Using Magnetic Resonance Imaging

  1. K.-H. Herrmann *a,
  2. A. Pohlmeiera,
  3. S. Wieseb,
  4. N. J. Shahb,
  5. O. Nitzschec and
  6. H. Vereeckenc
  1. a MOD, Research Center Juelich, D-52425 Juelich, Germany
    b IME, Research Center Juelich, D-52425 Juelich, Germany
    c ICG-4, Research Center Juelich, D-52425 Juelich, Germany

Abstract

The transport of Ni2+ ions in a column, filled with porous media, was observed in three dimensions and time by magnetic resonance imaging (MRI) in a clinical scanner. For porous media we used glass beads or quartz sand in a saturated continuous flow mode. The magnetic moment of Ni2+ decreased the T 1 relaxation time of 1H in aqueous solution. This concentration-dependent effect was used by a fast low angle shot (FLASH) MRI sequence for imaging the concentration of the dissolved ions. Since Ni2+ behaves as a conservative tracer under the chosen conditions, the tracer motion was representative for the water flow in the porous medium. Currently, we can achieve an isotropic spatial resolution of 1.5 mm and a temporal resolution of 170 s. The transport observation gives direct access to hydraulic flow properties of the porous media. The fluid flow velocity field was calculated by a fronttracking method and the statistical properties of the velocities were investigated. We also compared the experimental data with the three-dimensional particle tracking model PARTRACE, which uses the experimental flow field as input.

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Copyright © 2002. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.31:506–514.