Preparation and quality control of in?house reference materials for marine dissolved inorganic carbon and total alkalinity measurements

Charly A. Moras; Lennart T. Bach; Tyler Cyronak; Renaud Joannes-Boyau; Kai G. Schulz

doi:10.1002/lom3.10570

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Preparation and quality control of in?house reference materials for marine dissolved inorganic carbon and total alkalinity measurements

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Preparation and quality control of in?house reference materials for marine dissolved inorganic carbon and total alkalinity measurements

Charly A. Moras, Lennart T. Bach, Tyler Cyronak, Renaud Joannes-Boyau and Kai G. Schulz

Limnology and oceanography, methods, Vol.21(11), pp.637-644

11/2023

DOI: https://doi.org/10.1002/lom3.10570

Appears in Recent Faculty of Science and Engineering Publications

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Abstract

Accurate measurements of seawater carbonate chemistry are crucial for marine carbon cycle research. Certified reference materials (CRMs) are typically analyzed alongside samples to correct measurements for calibration drift. However, the COVID-19 pandemic led to a limited access to CRMs. In response to this shortage, we prepared and monitored in-house reference materials (IHRMs) for total alkalinity (TA) and dissolved inorganic carbon (DIC), over 12 and 15 months, respectively. Overall, TA was stable, but a slight increase in DIC of about 2 μmol kg−1 occurred over 15 months. The increase could potentially be attributed to bacterial growth, despite mercuric chloride fixation and repeated UV exposure. It is noted that this small increase was most likely within our instrument and measurements uncertainties. Our repeated measurements also identified a few bottles that had TA or DIC concentrations 4–5 μmol kg−1 higher than the rest, indicating issues during cleaning, fixation, or storage of individual bottles. This study emphasizes the importance of careful and continuous monitoring if self-prepared IHRMs are used. Given that the amount of work required is very high, IHRM preparation is only recommended when CRMs are not available.

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Title: Preparation and quality control of in?house reference materials for marine dissolved inorganic carbon and total alkalinity measurements
Creators: Charly A. Moras - Southern Cross University
Lennart T. Bach - University of Tasmania
Tyler Cyronak - Georgia Southern University
Renaud Joannes-Boyau - Southern Cross University
Kai G. Schulz - Southern Cross University
Publication Details: Limnology and oceanography, methods, Vol.21(11), pp.637-644
Publisher: Wiley
Grant note: Graduate School of the Southern Cross University, Lismore, Australia. Grant Number: Cat. 5-SCU Grad School.
Identifiers: 991013137300602368
Copyright: © 2023 The Authors. Limnology and Oceanography: Methods published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution License, (https://creativecommons.org/licenses/by/4.0/).
Academic Unit: Faculty of Science and Engineering; Science
Language: English
Resource Type: Journal article

Preparation and quality control of in?house reference materials for marine dissolved inorganic carbon and total alkalinity measurements

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