Surface charge density dependency on Al₂O₃ content in imogolite

Long-term stability of earthen materials in contact with acidic tailings solutions

“…The solubility of Fe in soils is, in large measure, controlled by the low solubility of the oxides and hydroxides of Fe(III), with amorphic Fe(OH)3 usually forming an upper limit on the activity of Fe3+. The term "amorphic" refers to solids which show a minimal X-ray diffraction pattern (Jenne 1972). The structure of Fe(OH)3 (ferric hydroxide) ranges from the amorphic to the crystalline depending on the mode of formation and age.…”

Waste/Rock Interactions Technology Program: the status of radionuclide sorption-desorption studies performed by the WRIT program

“…Linear adsorption typically occurs only at trace absorbate concentration in solution and trace loading onto the solid adsorbent surfaces. In both instances the adsorption refers to equilibrium conditions and further when used with mass (a) Amorphic -amorphous-like but in practice those that have a minimal X-ray diffraction (Jenne 1972). The term is used for materials intermediate between totally crystalline and totally amorphous materials as determined by X-ray diffraction.…”

Computed solid phases limiting the concentration of dissolved constituents in basalt aquifers of the Columbia Plateau in eastern Washington. Geochemical modeling and nuclide/rock/groundwater interaction studies

“…Data for the ground-water chemistry can be used to determine solubility equilibria which are important because the precipitation and dissolution of minerals and amorphic solids [i.e., "amorphous-like" but in practice those that have a minimal X-ray diffraction pattern (Jenne, 1972;1977)] control, in part, the concentrations of major solute species in the ground water. In addition, secondary solid phases can serve as important sorption substrates.…”