Cation-exchange properties of soil organic matter

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Abstract
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 Na4P2O7-0.l 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: Straw2+ and Ba2+ was small. Little temperature effect was observed for humic acid.