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Hexacyanoferrate(III) Fe(CN)63-, transport through coated montmorillonite clay films at a platinum electrode is studied with the cyclic voltammetric method. Experimental conditions are first established guaranteeing voltammetric detection based on a linear diffusion in the clay film. The square of the ratio (R2) of current intensities obtained at the clay modifed electrode (CME) and the bare Pt electrode measures the relative variation of the Fe(CN)63-, diffusion coefficient in the clay film. Thus, the effects of bathing electrolyte concentrations on R2 are investigated and related to the swelling properties of the montmorillonite clay characterized by X-ray diffraction and sedimentation volume results. According to an applied model for the electric conductivity of montmorillonite clay solution, a relationship between the formation factor F = 1/R2, the shape factor (α), and the clay film effective porosity (Φe) is established. The shape factor (α) includes orientation and axial ratio (the ratio (A/B) of t...

Hexacyanoferrate(III) Transport in Coated Montmorillonite Clay Films. Effects of Water-Soluble Polymers