AN 14 - Stable Isotope Ratio Measurement of Dissolved Inorganic Carbon (DIC)
WS-CRDS provides simple δ13C measurements of DIC, enabling the source type of these compounds to be determined.
There is an established need and methodology to measure dissolved inorganic carbon (carbonate and bicarbonate) concentrations in aqueous samples1. Carbon/water cycle studies use this technique to aid in assessment of the capture/storage capacity of seawater and its role in stabilizing atmospheric CO2 levels. Another such application is monitoring the performance of man-made sequestration projects where captured CO2 is stored in deep saline aquifers. A powerful additional metric that has been underexploited is the stable isotope ratio of the DIC i.e. δ13C. Since different sources of CO2, from plant respiration to fossil fuel combustion, have a characteristic δ13C value, measuring δ13C can provide important sourcing/tracing information about the origins of the DIC found in samples.