On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

In case of nuclear accident, 90Sr and 134,137Cs are major radionuclides to account. previous works (Appl. Geochem. 87, 167; ibid 93, 167), a database ion-exchange parameters allowing the description Sr2+ Cs + adsorption on purified illite smectite was developed for multi-site (MSIE) model. this study, behaviours Cs+ were obtained with <150 ?m fractions French soil samples: cambisol fluvic, calcosol, typic. The <2 samples analysed by X-ray diffraction estimate their clay minerals proportions that then approximated an illite/smectite mixture, in consistency CEC fractions. implemented K-illite -smectite account amendment K+ agricultural soils. isotherms three soils — at 0.033 mol kgw?1 CaCl2 (I = 0.1 kgw?1) pH value water equilibrated compared simulations using from MSIE This simulation approach, based additive properties between several reactive phases, allowed describe satisfactorily most cases. order highlight limiting modelling predictive ability, different treatments made samples. removal natural organic matter did not change significantly behaviour either or Cs+. exchangeable aluminium typic better isotherm Sr2+. Finally, satisfactory decrease Sr synthetic pore increasing concentrations KNO3 verify robustness model exchange database.