74
Exercise 6
Table 6.1. Solubility of oxygen in pure water in relation to
temperature in equilibrium with air at standard pressure
saturated with water vapor."
Equilibrium
Oxygen
Oxygen
temperature (t)
(C*)
(C' )
rC)
(mgl-I)
(,ugat kg - I)
0
14.621
913.9
14.216
888.5
2
13.829
864.4
3
13.460
841.3
4
13.107
819.2
5
12.770
798.2
6.
12.447
778.0
7
12.139
758.7
8
11.843
740.2
9
11.559
722.5
10
11.288
705.5
11
11.027
689.2
12
10.777
673.6
13
10.537
658.6
14
10.306
644.1
15
10.084
630.3
16
9.870
616.9
17
9.665
604.1
18
9.467
591.7
19
9.276
579.8
20
9.092
568.3
21
8.915
557.2
22
8.743
546.5
23
8.578
536.1
24
8.418
526.1
25
8.263
516.4
26
8.113
507.1
27
7.968
498.0
28
7.827
489.2
29
7.691
480.7
30
7.558
472.4
31
7.430
464.4
32
7.305
456.6
33
7.183
449.0
34
7.065
441.6
35
6.949
434.4
36
6.837
427.3
37
6.727
420.5
38
6.620
413.7
39
6.515
407.2
40
6.412
400.8
aFrom Mortimer (1981) after data of Benson and Krause (1980). Unit
standard concentrations (C* by volume in mg 1- I or mg dm - 3 and C' by
weight in ,ugat kg-I) of oxygen (1 mole = 31.9988 g) in pure water in
equilibrium with air at standard pressure (latm=760mmHg
= 101.325 Pal saturated with water vapor and with the dry air mole fraction
for oxygen taken as 0.20946. To convert mg to cm 3 (ideal gas S.T.P.) or to
,ugat, multiply mg by 0.70046 or 62.502, respectively. To convert Ilgat to
,umol, divide by 2. To convert C* to Ct, at temperature (tt and with the
accuracy of this table, multiply C* by the density of pure water at t".