The effect of pressure on the solubility of minerals in water and seawater

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Scientific paper

The effect of presure on the solubility of minerals in water and seawater can be estimated from In ( K P sp / K 0 sp ) + (- VP + 0.5 KP 2 )/ RT where the volume ( V ) and compressibility ( K ) changes at atmospheric pressure ( P = 0) are given by Values of the partial molal volume ( ) and compressibilty ( ) in water and seawater have been tabulated for some ions from 0 to 50°C. The compressibility change is quite large (~10 × 10 -3 cm 3 bar -1 mol -1 ) for the solubility of most minerals. This large compressibility change accounts for the large differences observed between values of V obtained from linear plots of In K sp versus P and molal volume data (Macdonald and North, 1974; North, 1974). Calculated values of K P sp / K o sp for the solubility of CaCO 3 , SrSO 4 and CaF 2 in water were found to be in good agreement with direct measurements (Macdonald and North, 1974). Similar calculations for the solubility of minerals in seawater are also in good agreement with direct measurements (Ingle, 1975) providing that the surface of the solid phase is not appreciably altered.

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