Direct speciation of ultra-trace platinum in marine ferromanganese oxides by wavelength-dispersive XAFS
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.
Authors
- Satoshi Tokeshi
- Kiyofumi Nitta
- Honami Sato (ORCID: https://orcid.org/0000-0002-1002-6453)
- Yusuke Watanabe (ORCID: https://orcid.org/0000-0001-9541-6073)
- James R. Hein (ORCID: https://orcid.org/0000-0002-5321-899X)
- Yuta Ijichi
- Akira Usui
- Sakiko Kikuchi
- Tomoya Uruga
- Akira Ishikawa
- Yoshio Takahashi
- Oki Sekizawa
- Teruhiko Kashiwabara
Institutions
- Tokyo Institute of Technology (JP)
- Japan Atomic Energy Agency (JP)
- United States Geological Survey (US)
- Planetary Science Institute (US)
- Japan Agency for Marine-Earth Science and Technology (JP)
- Kyushu University (JP)
- Japan Synchrotron Radiation Research Institute (JP)
- Kanagawa Dental University (JP)
- The University of Tokyo (JP)
- Kōchi University (JP)
Publication Details
- Journal
- Chemistry Letters
- Published
- 2026-08-26
- DOI
- https://doi.org/10.1093/chemle/upag171
- Primary Topic
- Geomagnetism and Paleomagnetism Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Japan Society for the Promotion of Science