Other
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71...46m&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 1, p. 46-55.
Other
Scientific paper
Potentiometric measurements of the stoichiometric constants for the dissociation of carbonic acid in NaCl solutions (K1∗=[H][HCO3-]/[CO] and K1∗=[H][CO32-]/[HCO3-]) have been made as a function of molality (0 6 m) and temperature (0 50 °C). The results have been fitted to the equations pKi∗-pKi=Ai+Bi/T+CilnT The values of pKi in pure water are taken from the literature and the adjustable parameters Ai, Bi and Ci are a function of molality A1=35.2911m+0.8491m-0.32m+0.055m B1=-1583.09m C1=-5.4366m A2=38.2746m+1.6057m-0.647m+0.113m B2=-1738.16m C2=-6.0346m (σ = 0.013 for pK1∗ and σ = 0.020 for pK2∗, N = 603). The values determined in this study are in good agreement with the 25 °C literature values. Our results have been combined with previous measurements to derive equations that are valid from 0 to 250 °C and 0 to 5 m. This large data set has been used to determine the Pitzer parameters (β(0), β(1) and Cϕ) for the interactions of Na+ with HCO3- and CO32- from 0 to 250 °C. These results extend the carbonate system Pitzer model to hydrothermal brines containing high concentrations of NaCl.
Graham Taylor
Huang Fen
Millero Frank
Pierrot Denis
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