微量磷灰石中磷酸根氧同位素分析方法

杜勇; 朱园园; 宋虎跃; 王宇航; 宋海军; 邱海鸥; 童金南

doi:10.3799/dqkx.2018.557

Volume 44 Issue 2

Feb. 2019

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Article Navigation > Earth Science > 2019 > 44(2): 456-462

Du Yong, Zhu Yunayuan, Song Huyue, Wang Yuhang, Song Haijun, Qiu Haiou, Tong Jinnan, 2019. Analytical Method for δ18O of Phosphate in Trace Apatite. Earth Science, 44(2): 456-462. doi: 10.3799/dqkx.2018.557

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Du Yong, Zhu Yunayuan, Song Huyue, Wang Yuhang, Song Haijun, Qiu Haiou, Tong Jinnan, 2019. Analytical Method for δ¹⁸O of Phosphate in Trace Apatite. Earth Science, 44(2): 456-462. doi: 10.3799/dqkx.2018.557

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Analytical Method for δ¹⁸O of Phosphate in Trace Apatite

doi: 10.3799/dqkx.2018.557

1.
State Key Laboratory of Biogeology and Environment Geology, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430223, China
3.
Faculty of Materials Sciences and Chemistry, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-12-08
Publish Date: 2019-02-15

Abstract

Abstract

The oxygen isotope composition of phosphate (δ¹⁸O_PO4) in bioapatite plays a significant role in paleo-environmental research as one of the ideal proxies for paleo-temperature reconstruction. However, for trace bioapatite(e.g., conodonts), a reliable pre-treatment technology is quite important and difficult for its δ¹⁸O_PO4 analysis, resulting in analytical technique established only in several overseas laboratories. Here we combine the advantages of those methods and present a protocol on the analysis of δ¹⁸O_PO4 as Ag₃PO₄ for bioapatite of total sample size as small as 0.2 mg using a thermal conversion elemental analyzer (TC/EA) coupled to a continuous flow isotope ratio mass spectrometer (CF-IRMS) via a helium stream. Ag₃PO₄ is precipitated by NH₃ buffer method after apatite being dissolved with nitric acid, Ca²⁺ being removed with KF solution and the solution being neutralized with ammonia buffer solution. The results indicate that analysis of δ¹⁸O_PO4 maintains an external precision of ±0.2‰(1σ), meeting the international analytical standards. This method for analyzing δ¹⁸O_PO4 of phosphate extracted from bioapatite is robust to be used to reconstruct paleo-temperature.
- bioapatite,
- oxygen isotope of phosphate,
- analytical method,
- biogeochemistry

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References(26)

References

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Analytical Method for δ18O of Phosphate in Trace Apatite

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Analytical Method for δ¹⁸O of Phosphate in Trace Apatite