SPECIFIC AND NON-SPECIFIC ADSORPTION OF INORGANIC IONS : II.Specific Adsorption of Cations on Kaolin and Kaolinitic Soil Clays

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The authors reported that the relative bonding strength between ligand of soil colloid surface and cations could be obtained easily by the measurement of MCSA, and that the MCSA corresponded to the constant of Langmuir's adsorption isotherm equation. The relative bonding strength of cations with respect to kaolinitic soil clay at pH 6 was, Cr^<3+>>Fe^<3+>, Al^<3+>>Ga^<3+>>Cu^<2+>>Pb^<2+>>Y^<3+>, La^<3+>>Mn^<2+>>Ni^<2+>, Co^<2+>> Zn^<2+>>Sr^<2+>, Mg^<2+>>NH_4^+, K^+, and with respect to colloid with humus coating, Y^<3+>, La^<3+>>Pb^<2+>>Cu^<2+>, and the other orders were same. The solubility of cations in soil colloid aqueous dispersion system was calculated from the values of MCSAs, and considered as follows. Y^<3+>, La^<3+>, Cu^<2+>, Pb^<2+>, Mn^<2+>, Ni^<2+>, Co^<2+> : concentration in soil solution and soil geochemical mobility may be regulated by the specific adsorption reaction, Zn^<2+>, Mg^<2+>, Sr^<2+>, K^+, NH_4^+ : concentration in soil solution and soil geochemical mobility may be regulated by the non-specific adsorption reaction, but at neutral to alkaline condition, Zn^<2+> and Mg^<2+> may specifically adsorb on soil, clays, Fe^<3+>, Cr^<3+>, Al^<3+>, Ga^<3+> : concentration in soil solution and soil geochemical mobility may be regulated by the solubility of their oxide hydrates.
社団法人日本土壌肥料学会の論文