土壌に吸収せられたる燐酸及び加里の電気透析に拠る析出
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概要
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Soils, different in their chemical constituents, were brought to absorb phosphoric acid and potassium by treating them with M/10 K_2HPO_4 solution. The so composite soil sample, after washed with methyl alcohol until tests with ammonium molybdate gave no precipitate, was taken into the middle chamber or Mattson's Cell and was electrodialyzed for 117 hours; the dialyzate from both chambers anode and cathode were equally renewed 1,4,21,45,69,93,and 117 hours respectively after the beginning of electrodialysis and the so dialyzed amounts of P_2O_5 and K_2O were determined, the former in each acid dialyzate (from anode chamber) after LORENZ method and the latter in each basic dialyzate (from cathode chamber) after cobaltinitrite method. The intensity of removal of absorbed P_2O_5 and K_2O from soils, designated in the ratio of dialyzed amount to that of absorbed, was approximately related to molecular ratios of SiO_2 to Al_2O_3 or Al_2O_3 + Fe_2O_3 of the soils after conc. HCL extraction method; namely, with increasing of the ratios removal of P_2O_5 was inclined to increase and that of K_2O decrease. Absorption of soils is generally considered to be influenced by the concentration and pH of solution besides the physical and chemical constituents of soils. In the case of this experiment also pH of the solution is easily imagined to influence the absorption of soils consequently the removal of P_2O_5 and K_2O from the soils. On the results of determination of pH by test paper method in the middle chamber of cell at the stages of beginning and also of final of electrodialysis, decrease of pH of the solution in the chamber was observed with completion of dialysis and accounted for the fact that the removal of P_2O_5 and K_2O of this experiment was managed under the influence of solution of having a tendency to reduce its pH. As the influence of such a nature as to reduce the pH of solution is expected in the soils of field where the soils have a tendency to become acidic, the results of this experiment will give some of the interpretations on the nature of removal of P_2O_5 and K_2O in the field where the soils have the same tendency.
- 1939-04-25
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関連論文
- カザリン颱風に依る赤城南麓の氾濫及び崩積土砂に就て(要旨)
- 土壌に吸収せられたる燐酸及び加里の電気透析に拠る析出
- 土壌より電気透析せらるる燐酸に就て
- Truog 氏土壌置換酸度定量法に就て
- pHの計算図表
- 土壌の置換中性点に就いて(第九回日本農学会大会本会部会講演要旨(承前))