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Batch adsorption experiments and spectroscopic investigations consistently show that aqueous Pu(IV) is quickly removed from solution and becomes incorporated in a brucite or hydroxylated MgO surface to a depth of at least 50nm, primarily as Pu(IV) within a pH range of 8.5–12.5, and is unaffected by the presence of the organic ligand, citrate. X-ray photoelectron spectroscopy (XPS), X-ray absorption...