改进的法拉第杯结构及其在富稀土元素磷灰石激光原位Sr同位素分析中的应用

童喜润; 李小丹; 邱啸飞; 蔺洁; 卢山松

doi:10.3799/dqkx.2023.136

Volume 49 Issue 11

Nov. 2024

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Article Navigation > Earth Science > 2024 > 49(11): 3904-3916

Tong Xirun, Li Xiaodan, Qiu Xiaofei, Lin Jie, Lu Shansong, 2024. An Improved Faraday Cup Configuration and Its Applying in Sr Isotopic Analysis of Rich⁃REE Apatite by LA⁃MC⁃ICP⁃MS. Earth Science, 49(11): 3904-3916. doi: 10.3799/dqkx.2023.136

Citation:

Tong Xirun, Li Xiaodan, Qiu Xiaofei, Lin Jie, Lu Shansong, 2024. An Improved Faraday Cup Configuration and Its Applying in Sr Isotopic Analysis of Rich⁃REE Apatite by LA⁃MC⁃ICP⁃MS. Earth Science, 49(11): 3904-3916. doi: 10.3799/dqkx.2023.136

Citation:

Tong Xirun, Li Xiaodan, Qiu Xiaofei, Lin Jie, Lu Shansong, 2024. An Improved Faraday Cup Configuration and Its Applying in Sr Isotopic Analysis of Rich⁃REE Apatite by LA⁃MC⁃ICP⁃MS. Earth Science, 49(11): 3904-3916. doi: 10.3799/dqkx.2023.136

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An Improved Faraday Cup Configuration and Its Applying in Sr Isotopic Analysis of Rich⁃REE Apatite by LA⁃MC⁃ICP⁃MS

doi: 10.3799/dqkx.2023.136

Tong Xirun^{1, 2
,
,},
Li Xiaodan^{1, 2},
Qiu Xiaofei^{1, 2},
Lin Jie³,
Lu Shansong^{1, 2}

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Research Center for Petrogenesis and Mineralization of Granitoid Rocks, Wuhan 430205, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2023-05-23
Publish Date: 2024-11-25

Abstract

Abstract

It is still difficult to accurately correct the interferences of REE²⁺ in Sr isotopic analysis by LA-MC-ICP-MS. In this study, we corrected the interferences of REE²⁺ by RPSM (Routine Peak Stripping Method) combining use of an improved cup configuration of MC-ICP-MS allowing for synchronic detection of REE²⁺ signals. The effectiveness of IFCC (Improved Faraday Cup Configuration) was evaluated with respect to both the synchrony and the ratios of REE²⁺ signals. With IFCC, no decoupling of REE²⁺ signals was observed. This finding indicates that IFCC is well suited for RPSM to correct the interferences of REE²⁺. The ratios of REE²⁺ signals (r: ^{166, 168, 170}Er²⁺/¹⁶⁷Er²⁺和^{170, 172, 174, 176}Yb²⁺/¹⁷³Yb²⁺) are approximately equal to (r/R≈1) the natural isotopic abundant ratios of Er an Yb (R: ^{166, 168, 170}Er/¹⁶⁷Er和^{170, 172, 174, 176}Yb/¹⁷³Yb). This property cause IFCC to be well suited to correct interferences of REE²⁺ with the R and the measured signals of ¹⁶⁷Er²⁺ and ¹⁷³Yb²⁺. We also determined the Sr isotopic compositions of the Er and Yb-spiked 0.1 μg/g NBS987 Sr solutions by SN-MC-ICP-MS with IFCC, and the results attest that the interferences of REE²⁺ in the solutions with Sr/Er≥3 can be corrected using the RPSM (R as the interference correction factor), and those in the solutions with Sr/Er≥1 can be corrected using the EPSM (Enhanced Peak Stripping Method, measured r as the interference correction factor). Sr isotopic compositions of two rich-REE reference materials (Durango with Sr/Er=7.4, and UWA-1 with Sr/Er=2.8) were determined by LA-MC-ICP-MS with IFCC, and the determined ⁸⁷Sr/⁸⁶Sr of the two reference materials are 0.706 27±0.000 14 (2SD, n=19) and 0.704 76±0.000 19 (2SD, n=20), respectively, both of which agree with previously published values (determined by TIMS or MC-ICP-MS) within uncertainties.
- Sr,
- isotopes,
- LA⁃MC⁃ICP⁃MS,
- double⁃charged ions of rare earth elements (REE²⁺),
- apatite,
- geochemistry

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References(35)

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