TY - JOUR
T1 - The estimation of the pK*HA of acids in seawater using the Pitzer equations
AU - Millero, Frank J.
N1 - Funding Information:
Acknowledgmenfs-Thiws ork wass upportedb y the Qcean-ographics ectiono f the NationalS cienceF oundation( OCE-8 120659a) nd the office of Naval Research( NQQ014-80-CO042).T he author wishest o thank Drs. Ken Pitzer and Andrew Dickson for their criticalc ommentso n this paper.
PY - 1983/12
Y1 - 1983/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0021059637&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021059637&partnerID=8YFLogxK
U2 - 10.1016/0016-7037(83)90037-6
DO - 10.1016/0016-7037(83)90037-6
M3 - Article
AN - SCOPUS:0021059637
VL - 47
SP - 2121
EP - 2129
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
IS - 12
ER -