The aim of this study is the determination of the ionic distribution versus the spatial coordinates within the membrane polymers. The confocal Raman spectroscopy is a useful tool for the study because it allows investigation of the species nature within materials. The studied membrane is a AW from Solvay (with a poly-4-vinylpyridine graft and an ethylene tetrafluoroethylene matrix). The first results are the pK value (2.25), verification of the graft's homogeneity in the whole membrane and an initial study about ionic transport within membrane and spectra analysis with factor analysis (principal components analysis and evolving factor analysis with multivariate curve resolution).