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Floating boat method for carbonate stable isotopic ratio determination in a GasBench II peripheral

Rangarajan, R and Pathak, P and Banerjee, S and Ghosh, P (2021) Floating boat method for carbonate stable isotopic ratio determination in a GasBench II peripheral. In: Rapid Communications in Mass Spectrometry, 35 (15).

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Official URL: https://doi.org/10.1002/rcm.9115


Rationale: Efficient high-precision stable isotope ratio determination using the GasBench II peripheral for carbonates involves loading of a reaction vial with carbonate powder and injection of phosphoric acid of high density for carbonate digestion. Herein, we present an alternative method, which bypasses the need for acid dosing with an automated pump. The advantages of the new method include minimization of clogging within capillaries caused by the acid, acid spillage, and diffusive fractionation due to repeated piercing of the septa. Methods: The alternative method involves the use of low-cost boats preloaded with carbonate powder introduced into an Exetainer vial preinjected with phosphoric acid and placed within the compartment of a heated block maintained at a constant temperature in the GasBench II. Results: The new method yielded an improvement in precision for δ13CVPDB and δ18OVPDB values during replicate analyses of NBS 19, with an overall precision of ±0.04� and ±0.06�, respectively. The accuracy and precision of analysis using the conventional method and the floating boat method were statistically re-evaluated using a bootstrap error analysis and Monte Carlo simulation methods. Conclusions: The proposed floating boat method of acid digestion showed significant improvement in analytical procedure and overall precision. This method is easily adoptable in other laboratories and is free from frequent issues of needle clogging and irregular fractionation due to diffusion facilitated by repeated puncturing of septa, and can serve as an alternative method for high-precision carbonate stable isotope analysis. © 2021 John Wiley & Sons Ltd

Item Type: Journal Article
Publication: Rapid Communications in Mass Spectrometry
Publisher: John Wiley and Sons Ltd
Additional Information: The copyright for this article belongs to John Wiley and Sons Ltd
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Division of Mechanical Sciences > Divecha Centre for Climate Change
Date Deposited: 07 Oct 2021 15:55
Last Modified: 07 Oct 2021 15:55
URI: http://eprints.iisc.ac.in/id/eprint/69656

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