土壌燐酸の固定とその有効化に関する研究(第1報) : 純系に於ける基礎研究(その一) : Fe と P の反応

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1. Concentrated in varying way, the interaction between two solutions, FeCl_3 and H_3PO_4,took place rapidly and reached equilibrium within a day (Table 1), froming iron-phosphate. In the range of pH, lower than is oelectric point of iron-hydrooxide, the formation of phosphate showed obviously lack of adsorption phenomena and could be regarded as chemical reaction. 2. According to the varying ratio, P/Fe, fixed phosphate changed its amount; the lower the ratio the higher the amount was fixed linearly (Fig. 1). 3. Phosphate fixation was remarkably governed by pH of the solution. In all cases of varying P/Fe ratio, the fixation took place hardly in pH, less than about the range between 2.5 and 35. With increasing of pH value, the fixation was enhanced until the value attained to 6. By an increase of hydroxyl ion, at higher value of pH, iron phosphate was seemed to be hydrolyzed. the pH range of maximum fixation of phosphate varied with P/Fe ratio in the system, that is, the more the ratio was reduced the more the range of pH enlarged, pH being shifted to higher value (Tab. 2). 4. Tte retention curve of iron at evry pH value was essentially simillar in its shape to that of phosphorus. (Fig 3). The pH limt of maximum retention, contrast to that of phosphorus, was shifted to lower with the increase of ratio (Tab. 2). Another point worthy of note as a special behavior in the iron retention is that, in a neighborhood of neutral point some portion of retained iron began to be released gradually and the release was developed to the maximum at slightly alkaline reaction, after which iron settled out again as a precipitate until all of them was retaind in higher pH. This depends on both the decomposition of iron-phosphate and the formation of hydroxide of iron, by the predominance of hydroxyl ion concentration in the system. This temporary release of iron at slightly alkaline side was developed to large extent with the increase of P/Fe ratio.
社団法人日本土壌肥料学会の論文
1953-07-20

土壌燐酸の固定とその有効化に関する研究(第1報) : 純系に於ける基礎研究(その一) : Fe と P の反応

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