CATION-EXCHANGE PROPERTIES OF SOIL ORGANIC MATTER : I.Effects of Conditions for the Measurement on Cation-exchange Capacity Values of Humic Acid Preparations

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概要

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• The CEC was determined for humic acid preparations by changing the conditions for the CEC procedure and the CEC values obtained were compared with those of clay minerals. Humic acid was extracted from Kodonbaru and Kuriyagawa surface soils, Iwanuma peat, and straw with 0.1_M Na_4P_2O_7-0.1_M NaOH. The CEC was measured by a method which eliminates washing for the removal of excess saturating salt. The CEC of humic acid became larger as humification progressed, and increased in the order : Straw<Iwanuma<Kuriyagawa<Kodonbaru. An equilibrium of cation exchange for the humic acid preparations was attained in a short time in contrast with that for allophane. No effect of salt concentration on the CEC of the humic acid preparations was recognized. The CEC of humic acid was also determined using the procedure in which the excess salt was removed by washing with water. Practically no decrease of CEC with decreasing salt concentration was found. When the pH of the salt solution was reduced, the CEC of the humic acid decreased, though the extent of the decrease was smaller than that of allophane. The CEC of halloysite and montmorillonite did not decrease through reduction of the pH of the salt solution. It was considered that humic acid is a stronger acid than allophane and a weaker acid than halloysite and montmorillonite. The difference between the CEC of humic acid measured with Ca^<2+> and Ba^<2+> was small. Little temperature effect was observed for humic acid.

• 社団法人日本土壌肥料学会の論文

著者

• Harada Yasuo

  National Institute Of Agricultural Sciences

• INOKO Akio

  National Institute of Agricultural Sciences

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