Effect of grain size on the 85Sr2+ sorption and desorption in columns of crushed granite and infill materials from granitic water under dynamic conditions

  • Š. Palágyi
  • K. Štamberg
  • V. Havlová
  • H. Vodičková
Article

Abstract

The sorption of 85Sr2+ in the form of 10−6 M Sr(NO3)2 in synthetic granitic water (SGW), and its desorption using the same radiotracer-free solution, were investigated under dynamic conditions in columns loaded with crushed granitic materials. The goal of study was to evaluate the influence of grain size on the retardation (R) and distribution (Kd) coefficients of the soluble 85Sr2+, as well as on the other transport parameters type of Peclet number (Pe) and hydrodynamic dispersion coefficient (Dd). Pure granitic sample and granitic fissure infill samples were used, crushed and sieved into 4 different grain size from 0.063 to1.25 mm were used. In order to determine migration parameters, the model based on erfc-function was used, assuming reversible equilibrium linear or non-linear (Freundlich) sorption/desorption isotherms. By means of both model approaches, the experimental breakthrough curves were fitted using non-linear regression procedure according to Newton–Raphson method. The obtained results also validated the applicability of the linear equilibrium isotherms of the 85Sr2+ sorption/desorption in the studied systems. It was found that in the case of linear isotherm approach, both retardation and distribution coefficients increased with decreasing grain size. Moreover, their values for fracture infill samples are higher than comparing to granite. Depending on the grain size, the retardation coefficient R varied between 11 and 25 for pure granite and 33–58 between for fissure infill material. These values correspond to distribution coefficients Kd of 2–7 and 9–24 cm3/g, respectively. Consequently, the sorption capacity of crushed rocks also increases with decreasing grain size and are about 2.5-times higher for fracture infill than in pure granite. The values of Dd increase with increasing grain size. Due to inverse proportion, values of Pe number are decreasing.

Keywords

Crystalline rocks Groundwater Sorption Desorption 85Sr Dynamic conditions Grain size Breakthrough curve Linear and non-linear isotherm Erfc-function model 

References

  1. 1.
    IAEA (2003) Scientific and technical basis for geological disposal of radioactive wastes, Vienna, Technical Report Series No 1413, pp 90Google Scholar
  2. 2.
    Palágyi Š, Fajman V (2002) The strategy of the long-term back-end nuclear fuel cycle in the Czech Republic, In: Factors determining the long term back-end nuclear cycle strategy and future nuclear systems, IAEA, Vienna, TECDOC-1286 p 49-56Google Scholar
  3. 3.
    IAEA (2007) Spent fuel and high level waste: Chemical durability and performance under simulated repository conditions, Vienna, TECDOC-1563, pp 29Google Scholar
  4. 4.
    Vanderborght J, Vereecken H (2007) One-dimensional modeling of transport in soils with depth-dependent dispersion, sorption and decay. Vadose Zone J 6:140–148CrossRefGoogle Scholar
  5. 5.
    Szenknect S, Ardois C, Gaudet JP, Barthes V (2005) Reactive transport of 85Sr in a chernobyl sand column: static and dynamic experiments and modeling. J Contam Hydrol 76:139–165CrossRefGoogle Scholar
  6. 6.
    Wang X, Du J, Tao Z, Fan J (2003) Migration characteristics of radionuclides 85+89Sr2+, 134Cs+, 125I,75SeO3 2− and 152+154Eu3+ in Chinese soils column investigation. J Radioanal Nucl Chem 258:133–138CrossRefGoogle Scholar
  7. 7.
    Sims DJ, Andrews WS, Creber KAM, Wang X (2005) Measuring and modeling the transport of fission products in unsaturated prairie soil. J Radional Nucl Chem 263:619–623CrossRefGoogle Scholar
  8. 8.
    Yoshida T, Suzuki M (2006) Migration of strontium and europium in quartz sand column in the presence of humic acid: effect of ionic strength. J Radional Nucl Chem 270:363–368CrossRefGoogle Scholar
  9. 9.
    Palágyi Š, Štamberg K, Vodičková H (2010) Transport and sorption of 85Sr and 125I in crushed crystalline rocks under dynamic flow conditions. J Radioanal Nucl Chem 283:629–636CrossRefGoogle Scholar
  10. 10.
    Li Y, Tian S, Quian T (2011) Transport and retention of strontium in surface-modified quartz sand with different wettability. J Radioanal Nucl Chem 289:337–343CrossRefGoogle Scholar
  11. 11.
    Palágyi Š, Štamberg K (2010) Transport of 125I, 137Cs+ and 85Sr2+ in granitic rock and soil columns. J Radioanal Nucl Chem 286:309–316CrossRefGoogle Scholar
  12. 12.
    Štamberg K, Palágyi Š (2012) Effect of grain size on the sorption and desorption of 137Cs in crushed granite columns and groundwater system under dynamic conditions. J Radioanal Nucl Chem 293:127–137CrossRefGoogle Scholar
  13. 13.
    Palágyi Š, Vodičková H (2009) Sorption and desorption of 125I, 137Cs+, 85Sr2+ and 152,154Eu3+ on disturbed soils under dynamic flow and static batch conditions. J Radioanal Nucl Chem 280:3–14CrossRefGoogle Scholar
  14. 14.
    Palágyi Š, Štamberg K (2011) Determination of 137Cs and 85Sr transport parameters in fucoidic sand columns and groundwater system. Central Eur J Chem 9:798–807CrossRefGoogle Scholar
  15. 15.
    Palágyi Š, Franta P, Vodičková H (2010) Determination of sorption capacity of fucoidic sands for Cs+ and Sr2+ under dynamic conditions. J Radioanal Nucl Chem 286:317–322CrossRefGoogle Scholar
  16. 16.
    Palágyi Š, Štamberg K (2010) Modeling of transport of radionuclides in beds of crushed crystalline rocks under equilibrium non-linear sorption isotherm conditions. Radiochim Acta 98:359–365CrossRefGoogle Scholar
  17. 17.
    Palágyi Š, Laciok A (2006) Sorption, desorptionand extraction of uranium from some sands under dynamic conditions. Czechoslov J Phys 56:D483–D492Google Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Š. Palágyi
    • 1
    • 2
  • K. Štamberg
    • 2
  • V. Havlová
    • 1
  • H. Vodičková
    • 1
  1. 1.Waste Disposal Department, Chemistry of Fuel Cycle and Waste Management DivisionNuclear Research Institute Řež plcHusinec-ŘežCzech Republic
  2. 2.Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical EngineeringCzech Technical UniversityPragueCzech Republic

Personalised recommendations