Oxygen Solubility in Fresh and Sea Water

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

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Normal dissolved oxygen in fresh and sea (salt) water at pressure ranging 1 - 4 bar abs are indicated in the diagram and tables below.

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

 

oxygen solubility in fresh and sea water

The salinity of sea water in the 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 varies with the location and depth. Water of 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 Sea Water - 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

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Related Topics

  • Material Properties - Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids

Related Documents

  • Air Solubility in Water - Amount of air that can be dissolved in water - decrease with temperature - increase with pressure
  • Oxygen - Chemical, Physical and Thermal Properties of Oxygen - O2
  • Oxygen - Specific Heat - Specific heat of Oxygen Gas - O2 - at temperatures ranging 175 - 6000 K
  • Salinity of Water - Water salinity of fresh, brackish and sea water
  • Solubility of Gases in Water - Solubility diagrams of gases like Carbon dioxide, Argon, Methane and other gases in water at different temperatures

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