TY - JOUR
T1 - The pK1* for the dissociation of H2S in various ionic media
AU - Hershey, J. Peter
AU - Plese, Tinka
AU - Millero, Frank J.
PY - 1988/8
Y1 - 1988/8
N2 - The stoichiometric pK1* for the dissociation of H2S 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 pK1* were also measured in NaCl with small amounts of added MgCl2 and CaCl2 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+, Mg2+ and Ca2+. Values of the pK1*, estimated using these coefficients, were found to be in excellent agreement with the measured values. Estimates of pK1* 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 H2S in most natural waters from 0 to 50°C and I = 0 to 6 m.
AB - The stoichiometric pK1* for the dissociation of H2S 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 pK1* were also measured in NaCl with small amounts of added MgCl2 and CaCl2 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+, Mg2+ and Ca2+. Values of the pK1*, estimated using these coefficients, were found to be in excellent agreement with the measured values. Estimates of pK1* 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 H2S in most natural waters from 0 to 50°C and I = 0 to 6 m.
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U2 - 10.1016/0016-7037(88)90183-4
DO - 10.1016/0016-7037(88)90183-4
M3 - Article
AN - SCOPUS:0024219711
VL - 52
SP - 2047
EP - 2051
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
IS - 8
ER -