The effect of pressure on the partial equivalent volumes of salts of the major ions in 35%, seawater at 10 and 25°C was determined for applied pressures of 400 and 1000 bars from measurements of the change in solution compression with salt concentration....
Bradshaw, Alvin, and Karl E. Schleicher. 1982. "Effect of pressure on the partial equivalent volume of salts in seawater." Journal of Marine Research 40, (3). https://elischolar.library.yale.edu/journal_of_marine_research/1607