ISO-CADICA: Isotopic - continuous, automated dissolved inorganic carbon analyser

RATIONALE Quantifying the processes that control dissolved inorganic carbon (DIC) dynamics in aquatic systems is essential for progress in ecosystem carbon budgeting. The development of a methodology that allows high‐resolution temporal data collection over prolonged periods is essential and is desc...

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Bibliographic Details
Published in:Rapid communications in mass spectrometry 2012-03, Vol.26 (6), p.639-644
Main Authors: Bass, Adrian M., Bird, Michael I., Munksgaard, Niels C., Wurster, Christopher M.
Format: Article
Language:English
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Summary:RATIONALE Quantifying the processes that control dissolved inorganic carbon (DIC) dynamics in aquatic systems is essential for progress in ecosystem carbon budgeting. The development of a methodology that allows high‐resolution temporal data collection over prolonged periods is essential and is described in this study. METHODS A novel sampling instrument that sequentially acidifies aliquots of water and utilises gas‐permeable ePTFE tubing to measure the dissolved inorganic carbon (DIC) concentration and δ13CDIC values at sub‐hourly intervals by Cavity Ring‐down spectrometry (CRDS) is described. RESULTS The minimum sensitivity of the isotopic, continuous, automated dissolved inorganic carbon analyser (ISO‐CADICA) system is 0.01 mM with an accuracy of 0.008 mM. The analytical uncertainty in δ13CDIC values is proportional to the concentration of DIC in the sample. Where the DIC concentration is greater than 0.3 mM the analytical uncertainty is ±0.1 ‰ and below 0.2 mM stability is 
ISSN:0951-4198
1097-0231
DOI:10.1002/rcm.6143