Computer Science
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3315c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 12, pp.3315-3328
Computer Science
3
Scientific paper
Molal oxygen activity coefficients ( O 2 ) in aqueous salt solutions from 0-100°C have been calculated from O 2 solubility data and established Henry's law constants. Pitzer specific interaction model parameters O 2 c , O 2 a and O 2 ca have been determined for the following ions: H + , NH + 4 Li + , Na + , Rb + , Cs + , Mg 2+ , Ca 2+ , Ba 2+ , Al 3+ , OH - , Cl - , Br - , I - , NO - 3 , SO 2- 3 , SO 2- 4 , HCO 3 - , CO 3 2- and PO 3- 4 . Results confirm that the effect of individual ions on In ( O 2 ) is additive. Model calculations of O 2 in seawater agree with experimentally derived values at normal salinities to within 0.2% at 298 K and 0.65% at 273 K. Additional data for brines of seawater composition enable the model to be used to represent O 2 empirically to a salinity of 255 S%. The model has thus far only been parameterised from measurements for single salt solutions. Comparisons with experimental data for brines suggest that additional model parameters, obtained from ternary solution data, will be required for accurate representation of O 2 in mixed salt solutions above about 5 mol kg -1 total ion concentration.
Brimblecombe Peter
Clegg Simon L.
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