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Updated: Jun 21, 2025

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Differences and implications of strontium distribution coefficient on various granite compositional materials.

Fangfei Cai1, Xiaoying Zhang2, Funing Ma3

  • 1College of Construction Engineering, Jilin University, Changchun, 130026, China.

Environmental Science and Pollution Research International
|July 16, 2024
PubMed
Summary

Strontium sorption on granite varies significantly between lab methods. Batch experiments yield much higher distribution coefficients (Kd) than dynamic tests, impacting radioactive waste repository safety assessments.

Keywords:
Batch sorption experimentColumn experimentCore-flooding experimentDistribution coefficientStrontium

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Nuclear Waste Management

Background:

  • The distribution coefficient (Kd) is vital for assessing high-level radioactive waste (HLW) geological repository safety.
  • Laboratory experiments like batch and column tests determine Kd, but discrepancies exist between methods.
  • Understanding these differences is crucial for accurate safety evaluations.

Purpose of the Study:

  • To evaluate and compare strontium (Sr) sorption on granite using static batch and dynamic (column, core-flooding) experiments.
  • To assess the impact of experimental methodology on Kd values for repository safety analysis.

Main Methods:

  • Static batch sorption experiments under varying conditions (pH, solid-liquid ratio, ionic strength).
  • Dynamic column experiments using crushed granite and mixed pure minerals, simulated with a two-site sorption model.
  • Core-flooding experiments on fractured granite, analyzed with a dual-porosity transport model.

Main Results:

  • Batch experiments showed higher Sr sorption on granite in acidic/alkaline conditions, low solid-liquid ratios, and low ionic strength.
  • Column experiments indicated higher Sr affinity for crushed granite compared to mixed pure minerals.
  • Kd values from batch tests were 4-20 times higher than column tests and 2-3 orders of magnitude higher than core-flooding tests.

Conclusions:

  • Experimental methods significantly influence determined Kd values for strontium sorption on granite.
  • Batch experiments overestimate Kd compared to dynamic methods relevant to repository conditions.
  • These findings are critical for refining safety assessments in HLW geological repositories.