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SODIUM, MAGNESIUM, AND CALCIUM SULFATE ION‐PAIRS IN SEAWATER AT 25C 1
Author(s) -
Kester Dana R.,
Pytkowicx Ricardo M.
Publication year - 1969
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1969.14.5.0686
Subject(s) - seawater , magnesium , sodium , chemistry , calcium , ionic strength , ion , ionic bonding , artificial seawater , sulfate , salt (chemistry) , inorganic chemistry , stoichiometry , analytical chemistry (journal) , mineralogy , environmental chemistry , oceanography , geology , aqueous solution , organic chemistry
The stoichiometric association constant of CaSO 4 0 ion‐pairs, K* CaSO4 = [CaSO 4 0 ]/[Ca 2+ ]× [SO 4 2− ], was found to be 10.8 ± 0.7 at 25C at an effective ionic strength of 0.67 and at 1‐atm pressure. The percentages of free and ion‐paired species in seawater were calculated from the experimentally determined association constants of NaSO 4 − , MgSO 4 0 , and CaSO 4 0 ion‐pairs. The results were used to calculate the effective ionic strength of seawater and to account for the difference in activity coefficients in seawater and in single‐salt solutions.