Application of "Four-Plane Model" to the Adsorption of K^+, NO_3^-, and SO_4^<2-> from a Mixed Solution of KNO_3 and K_2SO_4 on Andisols

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概要

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• To evaluate the interaction between anionic species when they were adsorbed on variable charge soils, we measured the adsorption of NO_3^- and SO_4^<2-> on an Andisol equilibrated with a mixture of KNO_3 and K_2SO_4 solutions. The amount of NO_3^- adsorption declined with the increase in the concentration of SO_4^<2->. On the other hand, the amount of SO_4^<2-> adsorption increased with the increase in the concentration of NO_3^-.These phenomena can not be explained by the simple "exchange theory" or the "Three-plane model" unless surface complexation is associated with the changes in the electrical potential of the surface. Therefore, in order to explain the phenomena by using the "Four-plane model" with surface complexation, a new equation was derived for the Diffuse Double Layer (DDL) charge from the "main equation of DDL theory" (equation of electrical potential in DDL) instead of the "Gouy-Chapman equation, " which can be used only for single symmetric electrolytes but nor for a mixture. By introducing the new equation to the computer program for analyzing the Four-plane model, the interaction between anionic species adsorbed on Andisols could be explained well. It was considered that SO_4^<2-> acted as a regulator for the ionic concentration, osmotic pressure and pH of the soil solution, and consequently, these factors affected the vertical distribution and mobility of anionic species and also the mobility of counter-ions in Andisols.

• 一般社団法人日本土壌肥料学会の論文
• 1996-12-00

著者

• KAMEWADA Kunihiko

  Tochigi Prefectural Agricultural Experiment Station

• Kamewada Kunihiko

  Tochigi Prefectural Agricultural Experiment Station:(present Address)tochigi Prefectural Agricultura

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• Increase in Cation Adsorption Induced by Surface Complexation of Sulfate on Andisols and Prediction by "Four-Plane Model"
• Vertical distribution of denitrification activity in an Andisol upland field and its relationship with dissolved organic carbon : Effect of long-term organic matter application(Soil Chemistry)
• Application of "Four-Plane Model" to the Adsorption of K^+, NO_3^-, and SO_4^ from a Mixed Solution of KNO_3 and K_2SO_4 on Andisols

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