Radiocesium Interception Potential (RIP) of smectite and kaolin reference minerals containing illite (micaceous minerals) as impurity.
Radiocesium Interception Potential (RIP) of smectite and kaolin reference minerals containing illite (micaceous minerals) as impurity.
复制标题
含有伊利石（云母矿物）杂质的蒙皂石和高岭土参考矿物的放射性铯截留电位 (RIP)。
DOI：
10.1080/00380768.2013.862158
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发表时间：
2013
影响因子：
2
通讯作者：
J.
中科院分区：
文献类型：
--
作者：
Ogasawara;S.;Nakao;A.;Yanai;J.
铯-137 （137Cs）在粘土矿物上有很强的吸附作用，特别是在伊利石上。然而，Cs+在参考粘土矿物上的吸附尚未充分研究与伊利石存在的关系。本研究的目的是澄清杂质（即伊利石和蛭石）的影响，存在于参考蒙脱石族矿物和高岭土矿物中，对Cs+的保留。用x射线衍射（XRD）对参比物的粘土矿物进行了表征。测定了放射性铯截留电位（RIP），作为评价粘土Cs+截留能力的指标。粘土中伊利石的含量由总钾(K)含量表示，因为伊利石是粘土组分中钾的主要来源。粘土中蛭石的含量由Cs饱和后试样在110℃加热后的Cs固定能力来表示。与其他蒙脱石族矿物相比，偏长土和贝德尔石具有极高的RIP值，尽管在XRD分析中没有观察到伊利石的峰值（1.0 nm）。参考蒙脱石和高岭土矿物显示出一定范围的RIP值，尽管它们的RIP值在理论上为零。各参考黏土矿物的总钾含量与RIP值呈显著正相关（rs= 0.621*）。这表明，对137cs的保留能力更多地取决于杂质伊利石的含量，而不是散装矿物的类型。因此，通过测量总K含量和XRD分析，阐明了伊利石对RIP大小的贡献。
Cesium-137 (137Cs) is strongly adsorbed on clay minerals, especially on illite. The adsorption of Cs+on reference clay minerals, however, has not been fully investigated in relation to the presence of illite. The objective of this study was to clarify the effect of impurities (i.e., illite and vermiculite), present in reference smectite group minerals and kaolin minerals, on the retention of Cs+. The clay mineralogy of the reference minerals was characterized by X-ray diffraction (XRD). The radiocesium interception potential (RIP) was measured as an index of the Cs+retention ability of clays. The content of illite in clay was represented by the total potassium (K) content given that illite is a major source of K in the clay fraction. The content of vermiculite in clay was represented by the Cs fixation capacity induced by Cs saturation followed by heating of samples at 110°C. Metabentonite and beidellite gave extremely high RIP values compared with other smectite group minerals, although a peak for illite (at 1.0 nm) was not observed in XRD analysis. The reference smectite and kaolin minerals showed a range of RIP values, even though their RIP values are theoretically zero. The RIP values had a significant positive correlation with the total K content of all the reference clay minerals (rs= 0.621*). This indicated that the retention ability for137Cs depended more on the content of illite, as impurity, rather than the type of bulk mineral. Hence, the contribution of illite to the magnitude of the RIP was elucidated by the combination of measurement of total K content and XRD analysis.