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Oral Sessions
Day 3, June 24（Tue.） 16:30-16:45
Room B (Maesato Center)
- 3B-O3-1630
Highly-sensitive LA-ICP-MS approaches for the determination of ultra-trace rare earth elements (REEs) and U-Th isotopes in stalagmites
(1Nanjing Normal University, 2National Taiwan University, 3ETH Zurich)
oChung-Che Wu1, Chuan-Chou Shen2, Detlef Günther3, Bodo Hattendorf3
Here we demonstrate two advanced LA-ICP-MS approaches for the determination of ultra-trace rare earth elements (REEs) U-Th isotopes in the carbonate stalagmites with their improved sensitivity. By adopting the
“jet" interface setup, limits of detection (LOD) reached as low as sub-ng/g range for REE standards and stalagmite samples. Application to a stalagmite collected from East Timor revealed at least two abrupt elevations in REEs, possibly contributed from the volcanic tephra. This jet interface setup for the U-Th dating approach enhanced the detection efficiency to 1-2%, which allows for the detection of sufficient amounts of the low abundant 230Th+(101-103 pg/g), in particular for Holocene stalagmites as young to 1000 years. We expect this highly-sensitive LA-ICP-MS setup could make substantial contributions to various fields in paleoclimatology, oceanography, environmental science, and archaeology.