To evaluate the effects of type of micaceous mineral and degree of weathering on the ability to adsorb and desorb radiocaesium (RCs) ions, various levels of weathering were induced (K‐depletion) in three types of micaceous minerals: biotite, muscovite and illite. The ability to adsorb RCs was represented by RCs interception potential (RIP) and a desorption ratio was determined by the amount of ¹³⁷Cs desorbed from the minerals by 1 M ammonium acetate (¹³⁷Cs desorption ratio). The RIP values were in the order of illite > biotite > muscovite. The RIP values for biotite gradually increased with the release of up to ~50% of the K⁺ from interlayer sites but then decreased with the further release of K⁺, up to ~100%, which was associated with the formation of a fully expanded interlayer: vermiculite. The change from increasing to decreasing RIP due to the weathering of the biotite strongly indicated that the selective adsorption sites for RCs are not located in an expanded interlayer but in intermediate sites between non‐expanded and expanded interlayers: frayed edge sites (FES). In contrast, for both the muscovite and illite, the RIP only increased. The ¹³⁷Cs desorption ratio, <7% for all the samples, tended to decrease with increasing degrees of weathering and did not differ greatly by mineral type. These results contribute to a more accurate prediction of the risk of RCs transfer from soils to crops and the understanding of the weathering processes of micaceous minerals in soils.

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云母类矿物吸附和解吸铯离子的能力：矿物类型和风化程度的影响

为了评估云母矿物类型和风化程度对放射性铯（RCs）离子吸附和解吸能力的影响，在三种类型的云母矿物中（黑云母，白云母和伊利石）诱导了各种水平的风化（贫K）。RC的吸附能力由RC截留电位（RIP）表示，并且解吸率由1 M醋酸铵从矿物中解吸的¹³⁷ Cs的量（¹³⁷ Cs的解吸率）确定。RIP值的顺序为伊利石>黑云母>白云母。黑云母的RIP值随着层间位点释放高达约50％的K ^+而逐渐增加，但随后随着K ⁺的进一步释放而降低，高达〜100％，这与形成完全膨胀的中间层：ver石有关。由于黑云母的风化，RIP从增加到减少的变化强烈表明，RC的选择性吸附位点不在膨胀的中间层中，而在未膨胀的中间层和膨胀的中间层之间的中间部位：磨损边缘部位（FES）。相反，对于白云母和伊利石，RIP仅增加。的¹³⁷ Cs的解吸率，<对于所有样品7％，倾向于随度风化的减少，并没有由矿物类型有很大的不同。这些结果有助于更准确地预测RCs从土壤转移到作物的风险，并有助于了解土壤中云母矿物的风化过程。