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# Oxygen - Solubility in Fresh and Sea Water vs. Temperature

## Solubility of oxygen in equilibration with air in fresh water and seawater (salt water) - pressures ranging 1 - 4 bar abs.

Normally dissolved oxygen from air in fresh water and sea water (salt water) at pressures ranging 1 - 4 bar abs are indicated in the diagrams and tables below.

Note! - in air with normal composition the oxygen partial pressure is 20% of the total pressure. This results in 20% oxygen dissolution from air compared to pure oxygen.

The salinity of seawater in oceans ranges 30 to 50 parts per thousand (30,000 - 50,000 ppm), on average 35 ppt.

• 35 g dissolved salt / kg sea water = 35 ppt = 35 o/oo = 3.5% = 35,000 ppm

The salinity is not uniform and vary with location and depth. Water with salinity between freshwater and seawater is called brackish.

### Oxygen Solubility in Fresh Water - Salinity ~ 0

 Solubility of Oxygen in Fresh Water - Salinity ~ 0 Pressure abs mm Hg 760 1520 3040 psi 14.7 29.3 58.7 bar 1 2 4 kPa 101.1 202.2 404.3 Temperature Solubility oC oF μMol mg/l ml/l μMol mg/l ml/l μMol mg/l ml/l 0 32 457 14.6 10.2 913 29.2 20.5 1823 58.4 40.9 5 41 399 12.8 9.1 798 25.5 18.2 1595 51.1 36.4 10 50 353 11.3 8.2 705 22.6 16.4 1411 45.1 32.8 15 59 315 10.1 7.5 630 20.2 14.9 1260 40.3 29.8 20 68 284 9.1 6.8 568 18.2 13.7 1137 36.4 27.3 25 77 258 8.3 6.3 517 16.5 12.6 1034 33.1 25.3 30 86 236 7.6 5.9 473 15.2 11.8 947 30.3 23.6 35 95 218 7 5.5 436 14 11 872 27.9 22.1 40 104 202 6.5 5.2 404 12.9 10.4 808 25.9 20.8 45 113 189 6 4.9 375 12 9.8 751 24 16.9 50 122 177 5.6 4.6 355 11.3 9.3 710 22.7 18.7

### Oxygen Solubility in Seawater - Salinity ~ 35

 Solubility of Oxygen in Sea Water - Salinity ~ 35 Pressure abs mm Hg 760 1520 3040 psi 14.7 29.3 58.7 bar 1 2 4 kPa 101.1 202.2 404.3 Temperature Solubility oC oF μMol mg/l ml/l μMol mg/l ml/l μMol mg/l ml/l 0 32 349 11.2 7.8 699 22.4 15.7 1399 44.8 31.3 5 41 308 9.9 7 616 19.7 14.1 1233 39 28 10 50 275 8.8 6.4 550 17.6 12.8 1099 35.2 25.6 15 59 248 7.9 5.9 495 15.9 11.7 991 31.7 23.4 20 68 225 7.2 5.4 450 14.4 10.8 901 28.8 21.7 25 77 206 6.6 5 413 13.2 10.1 826 26.4 20.2 30 86 190 6.1 4.7 381 12.2 9.5 761 24.4 18.9 35 95 176 5.6 4.5 353 11.3 8.9 706 22.6 17.9 40 104 165 5.3 4.2 329 10.5 8.5 658 21.1 16.9 45 113 154 4.9 4 308 9.9 8 616 19.7 16.1 50 122 146 4.6 3.8 292 9.4 7.7 585 18.7 15.4

## Related Topics

• Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.

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