Lysimetric and Chemical Investigations of Pedological Changes. Part 2. Equilibration of Profile Samples With Aqueous Solutions

Concentrations and Activities of Ions in Solutions Displaced From Basaltic Soils

“…Consequently equilibrium can only be reached very slowly. However, moderate success in predicting soil solution concentrations from mineral equilibria has been achieved by Van Breemen and Wielemaker ( 1974), and pedological changes have been investigated by analysis of lysimeter drainage waters Marshall et al, 1973;Misra et al, 1976); the minerals involved in these studies were similarly 'insoluble'. Further experimental work will show whether mineral equilibria have potential uses in understanding problems such a's phosphate fixation.…”

Free Energy of Formation of Beidellite from Apparent Solubility Measurements

“…Stability constants have not been derived for polymeric anionic complexes which some investigators (Plumb and Swaine, 1964;Marshall et al, 1973) have postulated may form in the alkaline range. Consideration of the cationic complex, AI6(OH)a~ -(Richbnrg and Adams, 1970), did not change significantly the calculated activity of A1 a + in slightly alkaline soil extracts (Misra et al, 1974).…”

“…This information would be helpful for a better understanding of the weathering reaction, beidellite ~ kaolinite (Marshall et al, 1973), occurring in the Mexico soil.…”

Soil and land potential

“…The works ofMarshall et al (1973) and Misra et al (1976) use field evidence, mathematical formulation and thermodynamic equations to study pedological changes. Zyvoloski et al (1976) use mathematical formulation to describe a twodimensional infiltration problem and Jury et al (1976) use a similar model for predicting the simultaneous movement of water and nitrate through a loamy sand.…”