Two errors were discovered in Labotka (1991) in the discussion of the fugacity of CO₂ that give a false impression on the accuracy of the expression by Powell and Holland (1985) for RT ln ƒ_CO2. Table 5 contains several errors that were not caught during proofreading. The values of the coefficients and their associated formulas are correctly listed in the revised Table 5. A different error in the calculation of the fugacities, plotted in Figure 5, gives the false impression that the fugacities calculated by this expression are too high. A corrected version of Figure 5 shows that the expression of Powell and Holland (1985) predicts values of ƒ_CO2 that are essentially identical to those of Shmonov and Shmulovich (1974). The statement at the top of p. 57 is incorrect.  I'm sorry that I didn't catch this error, and I thank Tim Holland for bringing this to my attention.

References

Labotka, T. C. (1991) Chemical and Physical Properties of Fluids.  in Kerrick, D. M., Ed., Contact Metamorphism. Reviews in Mineralogy26, 41-104.

Powell, R. and Holland, T. J. B. (1985) An internally consistent thermodynamic dataset with uncertainties and correlations: 1. Methods and a worked example. J. Met. Geol. 3, 327-342.

Shmonov, V. M. and Shmulovich, K. I. (1974) Molal volumes and equation of state of CO₂ at temperatures from 100 to 1000 °C and pressures from 2000 to 10,000 bars. Doklady Akademiya Nauk SSSR 217, 206-209.