Direct speciation of ultra-trace platinum in marine ferromanganese oxides by wavelength-dispersive XAFS
Abstract
Abstract 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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Authors: Teruhiko Kashiwabara, Yusuke Watanabe, Akira Ishikawa, Satoshi Tokeshi, Honami Sato, Yuta Ijichi, Sakiko Kikuchi, Oki Sekizawa, Kiyofumi Nitta, Tomoya Uruga, James R. Hein, Akira Usui, Yoshio Takahashi
Institutions: The University of Tokyo, Kyushu University, Japan Synchrotron Radiation Research Institute, Kōchi University, Tokyo Institute of Technology, Planetary Science Institute, Japan Agency for Marine-Earth Science and Technology, United States Geological Survey, Japan Atomic Energy Agency, Kanagawa Dental University