Abstract
Soil particle surface has negatively charge. Characteristics of organic mud change with adsorption of cation and organic matter has been reported. Understanding of transport and deposition of organic mud, we proposed a new measuring method of adsorption ion of organic mud. Moreover, we cleared that liquid limit varies because of the changing the type and cation concentration and ion concentration of pore water.
Amount of adsorption cation was measured based on the cation exchange capacity test. Adsorption cation of the sediment located at the tidal river and sea bottom were almost Ca2+, Na+, K+ and Mg2+. The ratio of adsorption cation was same and adsorption cation varies with amount of clay and silt. In the 90 % cations adsorbed on the organic mud changed to Ca2+, liquid limit of the mud decreased about 10 %. The pore water changed sea water to fresh water, liquid limit of the mud increased about 10 %. These phenomena can explain thickness of electrical double layer.
