| Firstly, the research and development of modern adsorption on solid-liquid interface, especially of soil adsorption and chemical solution theories hi both macroscopic and microscopic studies, are summarized respectively. Through a careful analysis on the problems therein and a detailed examination of present achievements, a model of "solubility equilibria in variable media " is proposed, and is examined by some known phenomenon. Then, combining the expression of phase diagram in inorganic chemistry and modern computer graphics technique, a new idea of adsorption research by 3D imaging technique is put forward, and an general approach is established, and the graphical and mathematical characteristics of curved faces that created are also presented. Thirdly, by description of ion adsorption on artificial goethite in NaCl-HCI-H2O and NaCl-NaH2PO4-H2O systems, the conditions that goethite particles keep steady are determined. It is found that in the electrostatic adsorption system, NaCl-HCl-H2O system, the steadiness of goethite particles is strongly relative to the concentration of H+ in equilibrium solution; while in the specific adsorption system of NaCl-NaH2PO4-H2O mixture, the steadiness is strongly relative to the concentration of H2PO4 in equilibrium solution. It is the [Na7H2PO4-] ratio that decides the steadiness of goethite particles. Finally, through the correlation analysis and mathematical processing on these 3D images, a characteristic model for phosphate adsorption is established as = AT, where aH is the activity ofH+ in solution, P is the concentration of phosphate and k is a coefficient relative to the solution constitute. By further discussion, it is found that the essentialunit of is an important term in X adsorption, which suggests the molecularstate and amount of the ion to be adsorpted, and thus the model of "solubility equilibria in variable media " is supported and tested in another way.
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