Physics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2047h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 8, pp.2047-2051
Physics
2
Scientific paper
The stoichiometric pK 1 * for the dissociation of H 2 S has been determined from emf measurements in NaCl from 0.1 m to saturation at 5, 25 and 45°C and in KCl solutions at 5 and 25°C. The values of pK 1 * were also measured in NaCl with small amounts of added MgCl 2 and CaCl 2 to I = 6.0 m at 25 °C. The results were used to determine Pitzer coefficients for the interactions of HS - ions with Na + , K + , Mg 2+ and Ca 2+ . Values of the pK 1 * , estimated using these coefficients, were found to be in excellent agreement with the measured values. Estimates of pK 1 * in seawater and Dead Sea water calculated from the Pitzer coefficients were in excellent agreement with measured values from 5 to 25°C. Thus, it is possible to characterize the thermodynamics of the first dissociation of H 2 S in most natural waters from 0 to 50°C and I = 0 to 6 m.
Hershey Peter J.
Millero Frank. J.
Plese Tinka
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