a18_CO3_H2O() calculates the 18O/16O fractionation factor
between carbonate ion CO3(2-) and water.
Details
$$\alpha^{18}_{CO3(2-)/H2O} = e^{2.39 \times \frac{1000}{T^{2}} - 0.00270}$$
The equation above and in the function is the uncorrected equation in Beck et al. (2005). They experimentally determined the fractionation factor using BaCO3 precipitation experiments. However, they applied the acid fractionation factor of calcite during the data processing and not that of BaCO3. The acid fractionation factor of BaCO3 is not known accurately, which may result in a bias of up to 1‰ in the calculated 1000lna values.
References
Beck, W. C., Grossman, E. L., & Morse, J. W. (2005). Experimental studies of oxygen isotope fractionation in the carbonic acid system at 15°, 25°, and 40°C. Geochimica et Cosmochimica Acta, 69(14), 3493-3503. doi:10.1016/j.gca.2005.02.003
See also
Other fractionation_factors:
a13_CO2g_CO2aq(),
a18_CO2acid_c(),
a18_CO2aq_H2O(),
a18_CO2g_H2O(),
a18_H2O_OH(),
a18_HCO3_H2O(),
a18_c_H2O(),
a_A_B()