u mol dm- 3
400
500
50
60
70
80
90
100
120
150 I
200
250
300
I
I ',' II I
I II' j
~ I 'I I I
f I
I
I , "
II, ,1,1
I
®
1:5
2 .0
1
2 •
5
i i '
I
OXYGEN FOUND
mg dm- 3
@
PERCENT
SATURAT ION
,........---,
10
'
15
20
25
30
40
6
8
9
%
50
60
70
80
90
10
I I
1'2
13
14
15 (6 I T
7
I .
.
.
140
160
180 200
220
250
4: 6
....
40°
35'
30'
25'
C
1 0 0
101.325
~PQ
~~l
'\ 6,0
= one olmosphere
~~
6.2
20'
15'
10'
5'
O'
-
~
\
6,4
- sl
?'(\~6,6
400
..
6. 8
30~
I
C20~
@
10~
O ~
0.60
H
4'0
OXYGEN. EQUILIBRIUM CONCENTRATION. mg dm- 3
• , I , .
,I~ t
I
I . I ,
'r , !
.! , '1 2
.
, .
'" ',' , , , . I
. , .
'.0, , I I
~i5 I I ! t , I
?jO
, I 1 8
. 5
I '
!
8 JO
,
, 7
j5 I
I
I
I
t
7.~ I I
I •
J
I
6iS,
I"," (' ,".' '.;' I" ,"
t ".1 i
1 ",'
I,,,. t
I I
II' ','
fj' ,1., I '
i "" l' ,,., ' '1
1'1
",''1 ' I • I r
I • I i l l i
I
I
r i i i
'i' i I f ' I
ii' I " I i i ' I •
I .
o
I
2
3
4
5
6
7
8
9
10 I I
12
13
14 15 16 17 18 19 20
22
24
26
28
30
32
34
36
38
CD TEMPERATURE °C.
Figure 6.1. Oxygen saturation nomogram. The nomogram provides estimates of: (a)
solubility of oxygen in fresh water in equilibrium with the atmosphere (at 100% humidity),
and
(b) percentage saturation of oxygen in samples at observed temperatures and oxygen
content.
Scale 1: Bottom scale =
water temperature CC);
upper scale =
corresponding
saturated concentration
(C*) oxygen in equilibrium with the atmosphere (at 100% humidity
and standard pressure of 760 mm Hg or 101.325 kPs).
Scale 2: Oxygen concentration (s) in
mg 1- 1
(lower) and Jlmoll- 1
(upper).
Scale 3: Percentage saturation of dissolved oxygen.
Scale 4: Scales to estimate equilibrium concentrations at pressures
(P) other than standard
(Ps.).
Place one end (point) of a scale (or calipers) at zero h
and extend the other end (point)
into the fan of scales corresponding to the altitude (in km) or pressure (lower or upper scale,
in mm Hg) to intersect with the water temperature among the temperature lines extending
from the fan ends. The distance from zero h
to the pressure (altitude)-temperature point
within the fan Scale 4
is then brought down onto Scale 1.
This distance is extended from the
temperature of the water from which oxygen concentration was determined to the right
(extended to the left of the water temperature on Scale 1 when the lake surface is below sea
level). Where a straight line between this point
and the oxygen concentration (Scale 1)
intersects Scale 3 gives the percentage saturation of dissolved oxygen. When the oxygen
concentration (s)
is below the range of Scale 2, multiply s by a convenient factor, e.g., 10.
Determine the percentage saturation as described above, but divide that estimate by the
factor to give the correct result.
[From Mortimer (1981). The oxygen content of air-saturated
fresh waters over ranges of temperature and atmospheric pressure of limo no logical interest.
Mitt. Int.
VeT. Limnol. 22, 23 pp.]
400
500
50
60
70
80
90
100
120
150 I
200
250
300
I
I ',' II I
I II' j
~ I 'I I I
f I
I
I , "
II, ,1,1
I
®
1:5
2 .0
1
2 •
5
i i '
I
OXYGEN FOUND
mg dm- 3
@
PERCENT
SATURAT ION
,........---,
10
'
15
20
25
30
40
6
8
9
%
50
60
70
80
90
10
I I
1'2
13
14
15 (6 I T
7
I .
.
.
140
160
180 200
220
250
4: 6
....
40°
35'
30'
25'
C
1 0 0
101.325
~PQ
~~l
'\ 6,0
= one olmosphere
~~
6.2
20'
15'
10'
5'
O'
-
~
\
6,4
- sl
?'(\~6,6
400
..
6. 8
30~
I
C20~
@
10~
O ~
0.60
H
4'0
OXYGEN. EQUILIBRIUM CONCENTRATION. mg dm- 3
• , I , .
,I~ t
I
I . I ,
'r , !
.! , '1 2
.
, .
'" ',' , , , . I
. , .
'.0, , I I
~i5 I I ! t , I
?jO
, I 1 8
. 5
I '
!
8 JO
,
, 7
j5 I
I
I
I
t
7.~ I I
I •
J
I
6iS,
I"," (' ,".' '.;' I" ,"
t ".1 i
1 ",'
I,,,. t
I I
II' ','
fj' ,1., I '
i "" l' ,,., ' '1
1'1
",''1 ' I • I r
I • I i l l i
I
I
r i i i
'i' i I f ' I
ii' I " I i i ' I •
I .
o
I
2
3
4
5
6
7
8
9
10 I I
12
13
14 15 16 17 18 19 20
22
24
26
28
30
32
34
36
38
CD TEMPERATURE °C.
Figure 6.1. Oxygen saturation nomogram. The nomogram provides estimates of: (a)
solubility of oxygen in fresh water in equilibrium with the atmosphere (at 100% humidity),
and
(b) percentage saturation of oxygen in samples at observed temperatures and oxygen
content.
Scale 1: Bottom scale =
water temperature CC);
upper scale =
corresponding
saturated concentration
(C*) oxygen in equilibrium with the atmosphere (at 100% humidity
and standard pressure of 760 mm Hg or 101.325 kPs).
Scale 2: Oxygen concentration (s) in
mg 1- 1
(lower) and Jlmoll- 1
(upper).
Scale 3: Percentage saturation of dissolved oxygen.
Scale 4: Scales to estimate equilibrium concentrations at pressures
(P) other than standard
(Ps.).
Place one end (point) of a scale (or calipers) at zero h
and extend the other end (point)
into the fan of scales corresponding to the altitude (in km) or pressure (lower or upper scale,
in mm Hg) to intersect with the water temperature among the temperature lines extending
from the fan ends. The distance from zero h
to the pressure (altitude)-temperature point
within the fan Scale 4
is then brought down onto Scale 1.
This distance is extended from the
temperature of the water from which oxygen concentration was determined to the right
(extended to the left of the water temperature on Scale 1 when the lake surface is below sea
level). Where a straight line between this point
and the oxygen concentration (Scale 1)
intersects Scale 3 gives the percentage saturation of dissolved oxygen. When the oxygen
concentration (s)
is below the range of Scale 2, multiply s by a convenient factor, e.g., 10.
Determine the percentage saturation as described above, but divide that estimate by the
factor to give the correct result.
[From Mortimer (1981). The oxygen content of air-saturated
fresh waters over ranges of temperature and atmospheric pressure of limo no logical interest.
Mitt. Int.
VeT. Limnol. 22, 23 pp.]