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

在发生核事故时，⁹⁰ Sr 和^134,137 Cs 是主要的放射性核素。在以前的工作中（Appl. Geochem. 87, 167; ibid 93, 167），开发了一个离子交换参数数据库，允许描述 纯化伊利石和蒙脱石上的 Sr ²⁺和 Cs  ⁺吸附，用于多位点离子-交换（MSIE）模型。本研究中，Sr ²⁺和Cs ⁺的吸附行为使用<150 μm 的法国土壤样品级分获得：cambisol fluvic、calcosol 和 cambisol typic。土壤样品的 <2 μm 部分通过 X 射线衍射分析以估计它们的粘土矿物比例，然后近似为伊利石/蒙脱石混合物，与 <150 μm 部分的 CEC 一致。该数据库使用钾-伊利石和-蒙脱石参数实施，以说明农业土壤中 K ⁺的修正。三种土壤上Sr ²⁺和 Cs ⁺的等温线— 0.033 mol kg _w ^-1 CaCl ₂ ( I  = 0.1 mol kg _w ^-1) 和与土壤平衡的水的 pH 值 - 然后与使用 MSIE 模型数据库中的离子交换参数获得的模拟进行比较。这种模拟方法基于几个反应相之间的附加吸附特性，可以在大多数情况下令人满意地描述 Sr ²⁺和 Cs ⁺的吸附。为了突出建模预测能力的限制参数，对土壤样品进行了不同的处理。天然有机物的去除没有显着改变 Sr ²⁺或 Cs ⁺的吸附行为. 在 Sr ²⁺的情况下，从 cambisol 类型中去除可交换铝可以更好地模拟吸附等温线。最后，在钙溶胶的情况下，使用合成 CaCl ₂孔隙水对 Sr 和 Cs 吸附降低的令人满意的建模，随着KNO ₃浓度的增加，可以验证 MSIE 模型的稳健性和数据库中的交换参数。