MODELS OF NATURAL FLUIDS - THE NETWORK OF CHEMICAL INTERACTIONS

Some aspects of chemical modelling for natural fluids are discussed, i ncluding (a) the dependence on ionic strength of activity coefficients according to different models (Specific Interaction Theory, Fitter an d Bromley Equation, extended Debye-Huckel type Equations, Ion Associat ion); (b) the dependence of complex formation constants on ionic mediu m; (c) the complexation ability of some important classes of ligands t owards major constituents of natural fluids; (d) computer programs for the calculation of free concentrations in multi-ligand/multi-metal sy stems; (e) literature data analysis. Two examples of critical analysis of literature data (on the formation of Cl- complexes of Cu2+ and Cd2 +) are also reported.