DIFFUSION COEFFICIENTS OF METALS IN NON-CONVENTIONAL MATERIALS (AGAROSE AND CELLULOSE ACETATE) USED IN THE DIFFUSIVE GRADIENTS IN THIN FILMS TECHNIQUE

DIFFUSION COEFFICIENTS OF METALS IN NON-CONVENTIONAL MATERIALS (AGAROSE AND CELLULOSE ACETATE) USED IN THE DIFFUSIVE GRADIENTS IN THIN FILMS TECHNIQUE. The DGT technique allows one to measure quantitatively free and labile metal species in aquatic systems. Nevertheless, for this approach, knowledge is required of the diffusion coefficients of the analytes in a diffusive layer. In this study, the diffusion coefficients of Hg(II), As(III), Mn(II), Mg(II), Cu(II), Cd(II) were determined in agarose gel and those of Ba(II), Cd(II), Cu(II), Mg(II), Mn(II) e Zn(II) in cellulose acetate membranes. These materials presented good performance and the reported results can be used as a data base for further DGT studies.