Letter | Published:

Role of Exchangeable Potassium and Magnesium on Caesium Absorption on Marine Sediments

Naturevolume 207page1010 (1965) | Download Citation



THE potassium ion fixed into the interlayer spacing of a clay mineral is not easily replaced, and the results of chemical analysis cannot distinguish these interlayer potassium and the structural potassium. Therefore, the total potassium obtained in the chemical analysis includes the gross structural potassium and the edge-site exchangeable potassium. One may assume, therefore, for the comparison of the adsorbability of various clay minerals, that the smaller the ratio of structural potassium, or alternatively the larger the ratio of exchangeable potassium to the total potassium, the greater will be the adsorption of metal ions, especially of rubidium and caesium, which are adsorbed in the dehydrated states having rather small cationic radii and can easily penetrate into the interlayer opening.

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  1. 1

    Grim, R. E., Clay Mineralogy (McGraw Hill, 1953).

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  1. Institute of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China



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