The estimation of the pK* HA of acids in seawater using the Pitzer equations

Frank J Millero

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The equations of Pitzer have been used to calculate the stoichiometric ionization constants, pK* HA, 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 pK* HA 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 pK* HA of acids in seawater.

Original languageEnglish (US)
Pages (from-to)2121-2129
Number of pages9
JournalGeochimica et Cosmochimica Acta
Volume47
Issue number12
DOIs
StatePublished - 1983

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Seawater
activity coefficient
Activity coefficients
seawater
Acids
Ionization
acid
ionization
Anions
anion

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

The estimation of the pK* HA of acids in seawater using the Pitzer equations. / Millero, Frank J.

In: Geochimica et Cosmochimica Acta, Vol. 47, No. 12, 1983, p. 2121-2129.

Research output: Contribution to journalArticle

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