Abstract
The sea water model of Garrels and Thompson (1962) has been applied to estimate variations in the apparent constants of the carbonate system in sea water. Analyses show that for open ocean water, corrections are negligible (less than 1%);, whereas in interstitial water of marine sediments K2′ and Ksp′ variations may reach ±10%. Experimental procedures used by some investigators to determine the solubility of CaCO3 in sea water, may have resulted in erroneous values, due to deviation of tested solutions from the average composition of sea water. Values for solubility product of CaCO3 in sea water of 19% Cl at 25°C given by MacIntyre (1965), are too high by at least 6%, as determined by the present analysis.
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