The estimation of the pK1HA of acids in seawater using the Pitzer equations |
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| Authors: | Frank J Millero |
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| Institution: | Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149 USA |
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| Abstract: | The equations of Pitzer have been used to calculate the stoichiometric ionization constants, pK1HA, for acids in NaCl media at 25°C. The calculated results for the ionization of HAc, H2O, B(OH)3, H2CO?3, H3PO4, H2PO?4, HPO2?4, H3AsO4, H2AsO?4 and HAsO2?4 are in good agreement with the measured values, providing higher order interaction terms (θ and ψ) are used. The pK1HA measurements of these acids in NaCl media containing Mg2+ and Ca2+ were used to determine Pitzer specific interaction parameters at I = 0.7. With these Pitzer coefficients, it was possible to make reliable estimates for the activity coefficients of anions in seawater (S = 35) that form strong interactions with Mg2+ and Ca2+. The calculated activity coefficients yield reliable estimates for the pK1HA of acids in seawater. |
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