32
F. J. Millero
Table 1.6. The equivalence conductance of sea water and lake waters at 25°C. Calculated using the composition data for the lakes from the literature: Lake Baikal (Callender and Granina 1997; Falkner et al.1991);
Lake Tanganyika (Degens et al. 1971; Edmond 1974); Lake Malawi (Wiiest et al.1996)
Ion
}.,o{l1
E;}.,o{l1
Sea water
Baikal
Malawi
Tanganyika
Na +
49.92
38.66
6.30
16.90
18.55
Mg
2+
53.04
9.25
10.89
12.62
23.91
Ca 2 +
60.96
2.07
39.92
21.34
4.50
K+
73.56
1.24
1.44
4.55
8.24
st
59.45
0.02
0.00
0.00
0.00
CI
76.41
68.87
0.77
4.14
6.47
SO~79.97
7.46
7.48
4.80
1.31
HCO;
44.50
0.13
39.62
39.75
39.64
-
Br
78.14
0.11
CO~69.83
0.06
0.30
F
44.50
0.01
B(OH)~
55.40
0.01
Ao=LE;AuW
127.87
106.43
104.39
102.62
KD=AoeT
80.26
0.131
0.270
0.751
KD(SW)a
0.221
0.444
1.303
KD(5W)/KD(Lake)
1.68
l.64
1.73
a Seawater diluted to same total salinity of the lake (at ST = 35, e T = 0.6277).
linity determined from the composition. If sea water is diluted to the same total salinity (Table 1.6), the conductivity of sea water at 25°C is 1.68 ±O.03 larger than the values for the lakes. Direct measurements of the conductance are needed to determine if
these methods are reliable.
Acknowledgements
The author would like to acknowledge the support of the Oceanographic Section of
the National Science Foundation and the National Oceanic and Atmospheric Administration for supporting this work.
References
Brewer PG, Bradshaw A (1975) The effect of non-ideal composition of sea water on salinity and density.
J Mar Res 33:157-175.
Callender E, Granina L (1997) Geochemical mass balances of major elements in Lake Baikal. Limnol
Oceanogr 42:148-155