TY - JOUR
T1 - High-sensitive XANES analysis at Ce L2-edge for Ce in bauxites using transition-edge sensors
T2 - Implications for Ti-rich geological samples
AU - Li, Wenshuai
AU - Yamada, Shinya
AU - Hashimoto, Tadashi
AU - Okumura, Takuma
AU - Hayakawa, Ryota
AU - Nitta, Kiyofumi
AU - Sekizawa, Oki
AU - Suga, Hiroki
AU - Uruga, Tomoya
AU - Ichinohe, Yuto
AU - Sato, Toshiki
AU - Toyama, Yuichi
AU - Noda, Hirofumi
AU - Isobe, Tadaaki
AU - Takatori, Sayuri
AU - Hiraki, Takahiro
AU - Tatsuno, Hideyuki
AU - Kominato, Nao
AU - Ito, Masaki
AU - Sakai, Yusuke
AU - Omamiuda, Hajime
AU - Yamaguchi, Akiko
AU - Yomogida, Takumi
AU - Miura, Hikaru
AU - Nagasawa, Makoto
AU - Okada, Shinji
AU - Takahashi, Yoshio
N1 - Funding Information:
We acknowledge the funding support from the JSPS fellowship (Grant No. P21313) to W. Li. This work was also supported by the Grants-in-Aid for Scientific Research (KAKENHI) from the MEXT and JSPS (Grant Nos. 19H01145, 19H01960, 19K15606, 19K21893, 19K23432, 20K15238, 20K20527, 21H00162, 21H03585, 21H05443, 21K18649, 21K18917, 22F21313, 22H00166, and 22H00166). This study was performed with the approval of JASRI/SPring-8 (Proposal Nos. 2022A0174 and 2022A0180 2019A1523, 2019B1498, and 2020A0174) and Photon Factory (2022G126, 2020G670, 2020G081, and 2018S1-001). The manuscript benefited from the comments of the editor and two anonymous reviewers.
Funding Information:
We acknowledge the funding support from the JSPS fellowship (Grant No. P21313 ) to W. Li. This work was also supported by the Grants-in-Aid for Scientific Research (KAKENHI) from the MEXT and JSPS (Grant Nos. 19H01145 , 19H01960 , 19K15606 , 19K21893 , 19K23432 , 20K15238 , 20K20527 , 21H00162 , 21H03585 , 21H05443 , 21K18649 , 21K18917 , 22F21313 , 22H00166 , and 22H00166 ). This study was performed with the approval of JASRI/SPring-8 (Proposal Nos. 2022A0174 and 2022A0180 2019A1523, 2019B1498, and 2020A0174) and Photon Factory (2022G126, 2020G670, 2020G081, and 2018S1-001). The manuscript benefited from the comments of the editor and two anonymous reviewers.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - Accurate determination of cerium (Ce) valence state is important for interpreting the Ce anomaly in geological archives for (paleo)redox reconstruction. However, the routine application of Ce L3-edge X-ray absorption near-edge structure (XANES) spectroscopy for detecting trace Ce in geological samples can often be restricted by coexisting titanium (Ti) due to the proximity of their fluorescence emission lines. Therefore, the signal-to-noise ratio of Ce L3-edge XANES spectra may not be sufficiently high for high-quality spectroscopic analysis. This study introduces a semi-quantitative approach appropriate for Ti-rich, Ce-dilute geological materials by synchrotron-based X-ray measurement at the Ce L2-edge. First, the results confirm that Ce L2-edge XANES spectra are able to avoid overlapping Ti Kβ emissions and provide more reliable information on the Ce valence state in Ti-rich materials relative to L3-edge XANES. Moreover, the application of transition-edge sensor (TES) could reach the higher sensitivity with better energy resolution than conventional silicon drift detector (SDD) to detect fluorescence X-ray (Ce Lβ1). The investigation on bauxites developed from the Columbia River Basalts shows that combining Ce L2-edge XANES and TES allows for resolving weak Ce fluorescence lines at the L2-edge from Ti-rich, Ce-dilute samples (Ti/Ce mass ratio up to ∼6000, tens of ppm Ce). The outcome emphasizes the practical possibility of investigating Ce redox state in Ti-rich geological samples.
AB - Accurate determination of cerium (Ce) valence state is important for interpreting the Ce anomaly in geological archives for (paleo)redox reconstruction. However, the routine application of Ce L3-edge X-ray absorption near-edge structure (XANES) spectroscopy for detecting trace Ce in geological samples can often be restricted by coexisting titanium (Ti) due to the proximity of their fluorescence emission lines. Therefore, the signal-to-noise ratio of Ce L3-edge XANES spectra may not be sufficiently high for high-quality spectroscopic analysis. This study introduces a semi-quantitative approach appropriate for Ti-rich, Ce-dilute geological materials by synchrotron-based X-ray measurement at the Ce L2-edge. First, the results confirm that Ce L2-edge XANES spectra are able to avoid overlapping Ti Kβ emissions and provide more reliable information on the Ce valence state in Ti-rich materials relative to L3-edge XANES. Moreover, the application of transition-edge sensor (TES) could reach the higher sensitivity with better energy resolution than conventional silicon drift detector (SDD) to detect fluorescence X-ray (Ce Lβ1). The investigation on bauxites developed from the Columbia River Basalts shows that combining Ce L2-edge XANES and TES allows for resolving weak Ce fluorescence lines at the L2-edge from Ti-rich, Ce-dilute samples (Ti/Ce mass ratio up to ∼6000, tens of ppm Ce). The outcome emphasizes the practical possibility of investigating Ce redox state in Ti-rich geological samples.
KW - Oxidation
KW - Redox
KW - SPring-8
KW - Valence state
KW - XANES
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U2 - 10.1016/j.aca.2022.340755
DO - 10.1016/j.aca.2022.340755
M3 - Article
C2 - 36641142
AN - SCOPUS:85145225883
SN - 0003-2670
VL - 1240
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
M1 - 340755
ER -