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我们对VPDB有多了解-第二部分:对现有 δ¹³C_VPDB参考材料的实验室间评估

Heiko Moossen¹, Pharahilda M Steur², Federica Camin³

¹Max-Planck-Institute for Biogeochemistry, Jena, Germany.

Rapid communications in mass spectrometry : RCM

|December 4, 2025

概括

这项研究验证了维也纳Peedee belemnite (VPDB) 和VPDB-LSVEC δ¹³C尺度的新碳酸参考材料. 这些材料确保在以前标准的不稳定性之后,准确的同位素比质谱测量.

科学领域:

地质化学地质化学
同位素比重质谱法质谱法质谱法
计量学计量学计量学

背景情况:

国际原子能机构批准了两个δ¹³C尺度:维也纳Peedee belemnite (VPDB) 和VPDB-LSVEC.
由于LSVEC材料的不稳定性,因此需要寻找替代参考材料 (RMs).
这项研究解决了对可靠的RMS的需求,以保持C测量的计量可追溯性.

研究的目的:

为了比较拟议的碳酸RM (IAEA-610, -611, -612, USGS44) 对于VPDB和VPDB-LSVEC δ¹³C尺度.
为这些RM推值,使用户能够准确地实现VPDB和VPDB-LSVEC尺度.
在同位素分析中对CO2演变的酸反应方法进行仔细检查.

主要方法:

在三个专家实验室进行了四个碳酸RM (IAEA-610, -611, -612,USGS44) 的比较.
使用高精度双入口同位素比重质谱仪.
评估仪器偏移和样品的实验室间可比性.

主要成果:

在IAEA-610, -611, -612和USGS44中报告的 δ¹³C_VPDB值分别为 -9.114 ± 0.011‰, -30.815 ± 0.011‰, -36.739 ± 0.020‰和 -42.073 ± 0.015‰.
这些值与以前发布的数据在测量不确定性范围内一致.
对于元素分析-同位素比重质谱法中常用的 RM,提供了 δ¹³C_VPDB和 δ¹³C_VPDB-LSVEC等级的值.

结论:

该研究成功地比较和验证了VPDB和VPDB-LSVEC δ¹³C尺度的新碳酸RM.
推值可以准确地实现这些关键的同位素尺度.
这些发现支持在科学研究中对δ¹³C测量的持续准确性和可比性.

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