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- W2324178514 abstract "Abstract In order to evaluate the possibility of tracing dissolved inorganic carbon (DIC) derived from calcite dissolution under open system conditions, controlled laboratory experiments using stable carbon isotopes were conducted in a specially designed reaction chamber with constant pH monitoring. The system design also allowed us to measure the forward and backward (degassing) gas transfer reactions rates. We confirmed that the degassing reaction rate can be two to four times slower than the gas transfer reaction rate depending on the differences in p CO 2 between the gas phase and the liquid. The isotopic analyses suggest that the carbon isotopic signature of DIC under open system conditions is controlled by the CO 2 carbon isotopic signature, the isotopic fractionation between CO 2 , the relative occurrence of the different DIC species, and changes in pH. We found that the isotopic signature of DIC is not affected by the isotopic signature of the calcite or the mechanism controlling the dissolution (protonation or hydration). Practically this study suggests that it is not possible to trace the DIC derived from calcite dissolution under open system conditions. It supports the approach of evaluating the pedogenic carbonate content by stable carbon isotopes methods. In open system conditions: a) pH can explain up to 8‰ variation in the DIC δ 13 C signature and b) temperature is the second most important factor affecting the δC 13 -DIC signature, and only at pH above neutrality." @default.
- W2324178514 created "2016-06-24" @default.
- W2324178514 creator A5030486699 @default.
- W2324178514 creator A5051694348 @default.
- W2324178514 date "2016-07-01" @default.
- W2324178514 modified "2023-09-27" @default.
- W2324178514 title "Inorganic carbon transformations between phases and its impact on its isotopic signature under open conditions" @default.
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- W2324178514 doi "https://doi.org/10.1016/j.geoderma.2016.03.014" @default.
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