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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.

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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.

Oxygen Solubility in Fresh and Salt Water - Chart (pdf)

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

Oxygen - Solubility in Fresh Water vs. Temperature
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

Oxygen - Solubility in Sea Water vs. Temperature
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

dissolution of pure oxygen

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