Interlaboratory Test for Stable Carbon Isotope Analysis of Dissolved Inorganic Carbon (DIC) in Geothermal Fluids.

CONCLUSIONS: The δ13 C values of solid Na2 CO3 and its solution and lake water (i.e. DIC concentration samples >100 mg/L carbon) are consistent among all the participating laboratories. The dispersion in the δ13 C values of solid CaCO3 is associated with its lower chemical affinity than that of Na2 CO3 . The poor reproducibility in the δ13 C values of geothermal fluids, collected at three points of a geothermal well, despite overall consistent trends regarding their collection points suggests inadequate sample handling (atmospheric CO2 exchange) and/or inappropriate analytical approaches (incomplete H3 PO4 acid reaction). PMID: 31783434 [PubMed - as supplied by publisher]
Source: Rapid Communications in Mass Spectrometry : RCM - Category: Chemistry Authors: Tags: Rapid Commun Mass Spectrom Source Type: research