A Toposequence of Fine-Textured Soils in the Hilly Area of Northernmost Hokkaido : IV. Hydrolitic Reaction of Aluminum in the Presence of Oxalic or Citric Acid Ligands

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The hydrolysis of aluminum in aqueous solution (10^<-3> M) was investigated in the presence of 10^<-3> M of oxalic or citric acid ligands. Upon titration with base, large aluminum hydrophilic colloids (0.2-2.0μm in diameter) predominated in the solution with the oxalic acid ligand, whereas micro-polymers smaller than 0.025μm in diameter were stable in the solution containing the citric acid ligand. The organic ligands were not incorporated into the colloids but were absorbed on the surface of the colloids. These findings suggest that the polymerization reaction of aluminum can take place even in the form of low molecular chelate complexes. Therefore hypotheses were put forward concerning the mechanism of the movement of aluminum and iron in the fine-textured Spodosols, in which the formation of low molecular chelate complexes was considered to be most important.
社団法人日本土壌肥料学会の論文