The pK1* for the dissociation of H2S in various ionic media

J. Peter Hershey; Tinka Plese; Frank J. Millero

doi:10.1016/0016-7037(88)90183-4

The pK₁^* for the dissociation of H₂S in various ionic media

J. Peter Hershey, Tinka Plese, Frank J. Millero

Ocean Sciences

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Abstract

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.

Original language	English (US)
Pages (from-to)	2047-2051
Number of pages	5
Journal	Geochimica et Cosmochimica Acta
Volume	52
Issue number	8
DOIs	https://doi.org/10.1016/0016-7037(88)90183-4
State	Published - Aug 1988

ASJC Scopus subject areas

Geochemistry and Petrology

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10.1016/0016-7037(88)90183-4

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title = "The pK1* for the dissociation of H2S in various ionic media",

abstract = "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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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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JO - Geochmica et Cosmochimica Acta

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The pK₁^* for the dissociation of H₂S in various ionic media

Abstract

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