東京大学 · 地球惑星科学
李温帥教授の研究室では、リチウム同位体を用いた地球化学的プロセスの tracer 機能に注目し、特に大陸風化の精密な追跡を目的とした高精度な同位体分析技術の開発を進めています。MC-ICP-MS を用いた新規二段式クロマトグラフィー分離法や、Q-ICP-MS を用いた高温プラズマ条件での同位体測定法の最適化が主な研究テーマです。また、K・Ca のXANESスペクトルを用いた鉱物相の特徴的識別手法の確立も進んでいます。
Figures are computed from collected data and may differ slightly.
The lithium isotope system can be an important tracer for various geological processes, especially tracing continental weathering. The key to this application is the accurate and precise determination of lithium isotopic composition. However, some of the previously established column separation methods are not well behaved when applied to chemically diverse materials, due to the significant variations in matrix/lithium ratios in some materials. Here, we report a new dual‐column system for lithiu
This study develops and optimizes a new method to measure lithium isotope ratios using a single collector quadrupole inductively coupled plasma mass spectrometer (Q-ICP-MS) operated under hot plasma (1550 W) conditions.
Potassium (K) and calcium (Ca) K ‐edge X‐ray adsorption near‐edge (XANES) spectroscopy were performed on thirty‐three chemical compounds and geological materials, including chemical reagents, organometallic compounds, silicates, carbonates and igneous rock reference materials. The results confirm that the fine structure of the K ‐edges for specimens is unique and distinguishable. The results suggest that compositional and local atomic variations strongly regulate spectral characteristics. Acquir
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