A CRITICAL EVALUATION OF 1 M KCl-EXTRACTION METHOD FOR DETERMINING EXCHANGEABLE Al IONS IN VARIABLE CHARGE SOILS
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概要
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To explain why soils rich in variable charge materials often lack 1 M KCl-extractable Al ions, I proposed a mechanism, an "induced hydrolysis" of exchangeable Al ions in the presence of variable charge materials at high salt concentrations. I extracted exchangeable Al from mixtures of a montmorillonite saturated with Al and a synthetic goethite using a 1 M KCl solution. The amount of the extractable Al (per unit weight of the montmorillonite) decreased with increasing proportion of the goethite in the mixtures. I interpreted this experimental result as supporting the proposed mechanism, i.e., H^+ released in the hydrolysis of Al is adsorbed on the goethite in a concentrated KCl solution and this removal of H^+ induces further hydrolysis, resulting in the polymerization or precipitation of Al as hydroxides. I calculated the amount of monomeric, therefore, extractable, Al as a function of the goethite content in the 1 M KCl-montmorillonite-goethite mixtures. The calculated amounts agreed well with the experimentally determined ones in the whole range of goethite content examined.
- 社団法人日本土壌肥料学会の論文
著者
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Wada Shin-ichiro
Department Of Agricultural Chemistry
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Wada Shin-ichiro
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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