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FTIR spectra of ALG-PEI (a) and APO-PEI (b) sorbents at different stages of use: pristine material, after conditioning at pH 7 (the pH of metal sorption, referenced as “sorbent + Soln.”), after Cs(I) or Sr(II) sorption, after five cycles of sorption/desorption; wavenumber range: 1800–400 cm−1.
