Cerium model fits

Comparison of model fit variances for cerium indicates a definite superiority of the DFO model over single-site sorption models. The large data scatter in groundwater cerium concentrations, and the ambiguity in extraction inventory trends, indicate that systems producing significant colloidal material may require more specialized models and experimental methods to fully understand their transport mechanisms ... 

We will thus seek in the models, and taking into account the shape of the grains, the curve Otheor ( ), which fits best the experimental curve Oexp ( ), and that by testing various values of the Ag parameter, such as in Figure 11.6, obtained for the oxidation of the cerium hydroxycarbonate by oxygen [VER 95]. 

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