Physics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2403c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 12, pp.2403-2421
Physics
10
Scientific paper
The calculation of the percentage of un-ionised ammonia in estuarine water and seawater requires values of the stoichiometric dissociation constant of ammonia, defined by: K * a /mol kg -1 = m NH 3 m H + / m NH + 4 , where m denotes molality. A thermodynamic model of seawater, including dissolved NH 3 and NH + 4 , is developed using an extended Pitzer formalism parameterised from available data. The model is validated using emf measurements for cells containing artificial seawater with added HCl, and NH 4 Cl, and NH 3 over a range of temperatures and salinities. Calculated values of K * a are tabulated from 0 to 40 ppt salinity and -2 to 40°C, on both a free ( m H + ) and total ( m H + + m HSO - 4 ) hydrogen ion basis for use with pH measurements made on the corresponding scales. Accuracy (in K * a ) is likely to be better than 5% at all temperatures and salinities.
Clegg Simon L.
Whitfield Michael
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