Stability Behavior of Soil Colloidal Suspensions in Relation to Sequential Reduction of Soils : III. Electrokinetic Behavior of Colloidal Particles in Submerged Soils
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概要
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The electrokinetic behavior of colloidal particles in three waterlogged soils at 38℃ was investigated with reference to the stability changes of soil colloidal suspensions under reductive conditions. The dispersed clay particles of the three soils exhibited a negative zeta (ζ) potential. The absolute value of the ζ-potential, |- ζ|, of these soils in the earlier period of waterlogging decreased, which caused the floceulation of clay particles. The concentrations of divalent eations, i.e., Fe^<2+> and Ca^<2+> in the soil solutions were estimated to be higher than their critical floeculation concentrations (CFCs) on the basis of the observed CFCs of Fe^<2+> and Ca^<2+> for the clay suspension of halloysite as a reference. With the progression of the reduction process, clay particles of one soil still exhibited a low |-ζ| and flocculated. The concentrations of Fe^<2+> and Ca^<2+> in the soil solutions were estimated to be higher than their CFCs, respectively. The clay particles of two sandy soils, however, showed an increase in |-ζ| due to the increase in pH and dispersed. The concentrations of Fe^<2+> and Ca^<2+> in the soil solutions were estimated to be lower than their CFCs, respectively. The stability changes of the soil colloidal suspensions by these divalent eations under sequential soil-reduction can be explained by the alteration of the Stern potential (-Ψ_δ), which determines the repulsion energy related to the potential energy of interaction between two particles. The apparent decrease in the Ca^<2+> concentration of the soil solutions in the later period of waterlogging was explained largely by the re-adsorption of water-soluble Ca^<2+> on the exchange sites of soil clays with the decrease in the Fe^<2+> concentration in the soil solution.
- 一般社団法人日本土壌肥料学会の論文
著者
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Horikawa Yukiya
Faculty Of Agriculture Kochi Univers
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Li Zhonghai
Faculty Of Agriculture Kochi University:(present Address)department Of Non-timber Forestry Central S
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Li Zhonghai
Faculty Of Agriculture Kochi University
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