By slow removal of CO2 from Ca(HCO3)2 solution containing MgCl2 at room temperature, pure and homogeneous aragonite crystals were obtained. During the crystal syntheses, labeling with either or both C14 and Ca45 was feasible.
In the northeastern Pacific Ocean, north of 22 degrees N and east of 180 degrees W, a deep-sea pH maximum of 7.9 exists near 4000 meters. The effect of hydrostatic pressure on the dissociation constants of carbonic acid in sea water appears to be important in its formation.
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