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Radioactive strontium transport in soil and groundwater was studied over 11 years. A secondary, slow sorption process significantly impacts strontium mobility, affecting long-term contaminant modeling.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Radiochemistry

Background:

  • Radioactive strontium is a prevalent radiological contaminant in soil and groundwater.
  • Understanding strontium's long-term transport is crucial for environmental remediation and nuclear waste management.

Purpose of the Study:

  • To evaluate strontium (Sr) transport in soil over an 11-year field lysimeter study.
  • To quantify secondary aging effects on Sr-sediment interactions for improved long-term transport modeling.

Main Methods:

  • Conducted batch sorption/desorption tests using Sr isotopes (85Sr, 88Sr, 90Sr) and sediment from a long-term lysimeter.
  • Performed numerical modeling of 90Sr depth profiles using field data.
  • Analyzed Sr sorption coefficients (Kd) after varying contact periods.

Main Results:

  • Strontium exhibited largely reversible and linear sorption behavior.
  • Sorption coefficients (Kd) after 23 days were comparable to desorption Kd values after 24 years.
  • Numerical modeling indicated a Kd of 32 mL g(-1) best fit the lysimeter data, though it overestimated mobility below the source term.

Conclusions:

  • A single Kd value adequately described most Sr transport trends.
  • A slower, secondary sorption reaction occurring over months to decades likely explains the overestimation of Sr mobility below the source.
  • This secondary aging effect is critical for accurate long-term strontium transport modeling.