Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate-Based Standardization.
Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate-Based Standardization.
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DOI：
10.1029/2017gc007385
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Ziegler M
中科院分区：
文献类型：
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作者：
Bernasconi SM;Müller IA;Bergmann KD;Breitenbach SFM;Fernandez A;Hodell DA;Jaggi M;Meckler AN;Millan I;Ziegler M
在其引入大约十年后，碳酸盐聚集同位素测温领域正在迅速扩大，因为它有大量的可能应用及其解决地球科学中长期存在的问题的潜力。限制该方法应用的主要因素是有意义的解释所需的非常高的分析精度、相对复杂的样品制备程序以及所需的质谱校正。在本文中，我们首先简要回顾了分析和标准化程序的演变，并讨论了主要的不确定性来源。我们建议使用碳酸盐标准将结果投影到二氧化碳平衡标度可以提高实验室间数据的可比性，并有助于解决实验室和温度校准之间长期存在的差异。碳酸盐的使用减少了与气体制备和清洁程序相关的不确定性，并确保样品和标准品的平等处理。我们提出了一套碳酸盐标准的不同组成，讨论他们如何可以用来纠正质谱偏差，并证明他们的使用显着提高了四个实验室之间的可比性。我们建议，使用这些标准或一套类似的碳酸盐标准将提高实验室之间数据的可比性。我们提出了一个基于碳酸盐的标准化方案，以提高重现性，我们证明了聚块同位素测量的实验室间可比性的改善
About a decade after its introduction, the field of carbonate clumped isotope thermometry is rapidly expanding because of the large number of possible applications and its potential to solve long‐standing questions in Earth Sciences. Major factors limiting the application of this method are the very high analytical precision required for meaningful interpretations, the relatively complex sample preparation procedures, and the mass spectrometric corrections needed. In this paper we first briefly review the evolution of the analytical and standardization procedures and discuss the major remaining sources of uncertainty. We propose that the use of carbonate standards to project the results to the carbon dioxide equilibrium scale can improve interlaboratory data comparability and help to solve long‐standing discrepancies between laboratories and temperature calibrations. The use of carbonates reduces uncertainties related to gas preparation and cleaning procedures and ensures equal treatment of samples and standards. We present a set of carbonate standards of diverse composition, discuss how they can be used to correct for mass spectrometric biases, and demonstrate that their use significantly improves the comparability among four laboratories. We propose that the use of these standards or of a similar set of carbonate standards will improve the comparability of data across laboratories. Standardization and correction procedures for carbonate clumped isotopes are reviewed We propose a carbonate‐based standardization scheme to improve reproducibility We demonstrate improved interlaboratory comparability of clumped isotope measurements