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Spectroscopic analysis reveals oxygen-coordinated platinum(IV) associated with manganese in marine ferromanganese oxides, highlighting mechanisms behind ultra-trace platinum enrichment.
Ultra-trace platinum (Pt) in marine ferromanganese oxides (FMOs) has remained inaccessible to direct XAFS analysis because of its extremely low abundance and severe interferences from co-existing elements. We achieved the first direct speciation of Pt at the 1 μg g−1 level using wavelength-dispersive XAFS with a bent crystal Laue analyzer. Pt L3-edge XANES revealed that Pt occurs predominantly as O-coordinated Pt(IV), together with a positive spatial correlation with Mn, providing molecular-scale constraints on mechanisms of Pt enrichment into FMOs.
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Kashiwabara et al. (2026) studied this question.
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