The coordination environment of metal atoms involved in their adsorption on chitosan was studied by using EXAFS technique. Chromium, mercury and copper complexes were gotten on natural, crosslinked and multilayer chitosan films and the spectra of the distribution of neighbor atoms around the adsorbed central atom were obtained. All spectra were obtained in transmission mode and were collected around Hg (12284eV) L edge, Cr (5989eV) and Cu (8987eV) K edges. For chromium ions, it was possible to observe that metal interaction is mainly performed on amino groups, on the other hand, it was not possible to distinguish if the metal interaction takes place preferentially on amino or hydroxyl group, for mercury and copper.
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