Dispersion flocculation properties of agricultural land soils and factors affecting the dispersion
2002
"Akae, T. (Okayama Univ. (Japan)) | Goto, M. | Ishiguro, M. "
"On conducting agricultural land reclamation projects, prevention of turbid water is one of important issues. In order to evaluate physico-chemical factors which play predominant role in dispersion of soils, relations between the factors, cation exchange capacity (CEC), surface area, organic water content and dispersion-flocculation properties of the soils from agricultural lands in Chugoku and Shikoku region were studied. From the experimental results, clay dispersion showed higher correlation with specific surface area and cation exchange capacity of the soils. Change in surface charge characteristics of clay particles due to gypsum application was discussed based on DDL theory, and the reasons of changes in dynamic stability of clay suspensions against sedimentation were discussed. In course of surface potential calculation, permanent charges measured by potentiometric titration method were used. Smaller particles with larger surface area showed higher stability of suspension against sedimentation. Application of gypsum enhanced flocculation of soil suspensions and decreased clay dispersion. Surface potentials and edge potentials decreased remarkably on the soils which showed greater flocculation effect by gypsum application."
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