INFLUENCES OF ALUMINUM IONS ON THE DETERMINATION OF ZPC (ZERO POINT OF CHARGE) OF VARIABLE CHARGE SOILS

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概要

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• Influence of Al dissolution on soil ZPC (zero point charge) measured by a potentiometric titration (PT) method and a modified salt titration (STPT) method was examined using two strongly weathered soils from Thailand and two volcanic ash soils from Japan. The amount of dissolved Al ions increased with the increase in the concentration of a supporting electrolyte for the strongly weathered soils, while the increase was negligible for the volcanic ash soils. ZPC value of the strongly weathered soils determined by the PT method was lower than that by the STPT method, due to the greater Al dissolution associate with the higher electrolyte concentration used in the PT method. Al ions absorbed onto the soil surface would shift the ZPC to a higher pH value not as a result of the formation of hydroxy Al polymers, but due to the blocking of permanent negative charge sites, which could otherwise lower the ZPC. The σ_p value, as a measure of permanent charge or the amount of H^+ or OH^- absorbed by a soil required to attain the ZPC, could be used to describe this phenomenon. In the STPT method, the salt concentration was not high enough to cause a significant Al dissolution at the ZPC, which is considered to be a more suitable condition than in the PT method because the ZPC value can be evaluated at a low salt concentration as in the case of field conditions for crop production. Thus, the STPT method is recommended for the determination of the ZPC.

• 社団法人日本土壌肥料学会の論文

著者

• Sakurai K

  Kyoto Univ. Kyoto Jpn

• Sakurai Katsutoshi

  Soil Science Laboratory Faculty Of Agriculture Kyoto University

• NAKAYAMA Akinori

  Soil Science Laboratory, Faculty of Agriculture, Kyoto University

• WATANABE Tsutomu

  Soil Science Laboratory, Faculty of Agriculture, Kyoto University

• KYUMA Kazutake

  Soil Science Laboratory, Faculty of Agriculture, Kyoto University

• Nakayama Akinori

  Soil Science Laboratory Faculty Of Agriculture Kyoto University

• Kyuma Kazutake

  Soil Science Laboratory Faculty Of Agriculture Kyoto University

• Watanabe Tsutomu

  Soil Science Laboratory Faculty Of Agriculture Kyoto University

関連論文

• INFLUENCES OF ALUMINUM IONS ON THE DETERMINATION OF ZPC (ZERO POINT OF CHARGE) OF VARIABLE CHARGE SOILS
• POTENTIOMETRIC AUTOMATIC TITRATION (PAT) METHOD TO EVALUATE ZERO POINT OF CHARGE (ZPC) OF VARIABLE CHARGE SOILS
• FACTORS AFFECTING ZERO POINT OF CHARGE (ZPC) VARIABLE OF CHARGE SOILS
• COMPARISON OF SALT TITRATION AND POTENTIOMETRIC TITRATION METHODS FOR THE DETERMINATION OF ZERO POINT OF CHARGE (ZPC)
• Changes in Zero Point of Charge (ZPC), Specific Surface Area (SSA), and Cation Exchange Capacity (CEC) of Kaolinite and Montmorillonite, and Strongly Weathered Soils Caused by Fe and Al Coatings
• Changes in Zero Point of Charge (ZPC), Phosphate Retention, and Specific Surface Area of Some Variable Charge Soils after Several Chemical Treatments

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