Appendix A - Computation of Oxygen Solubility (Oxsol)
Ts = ln [(298.15 – T) / (273.15 + T)]
Oxsol(T,S) = exp {A0 + A1(Ts) + A2(Ts)
2
+ A3(Ts)
3
+ A4(Ts)
4
+ A5(Ts)
5
+
S * [B0 + B1(Ts) + B2(Ts)
2
+ B3(Ts)
3
] + C0(S)
2
}
Where
• Oxsol(T,S) = oxygen saturation value = volume of oxygen gas at standard temperature and pressure
conditions (STP) absorbed from humidity-saturated air at a total pressure of one atmosphere, per unit
volume of the liquid at the temperature of measurement (ml/l)
• S = salinity (psu)
• T =
water temperature (
o
C)
• A0 = 2.00907 A1 = 3.22014 A2 = 4.0501 A3 = 4.94457 A4 = 0.256847 A5 = 3.88767
• B0 = -0.00624523 B1 = -0.00737614 B2 = -0.010341 B3 = -0.00817083
• C0 = -0.000000488682
The table below contains oxygen saturation values at atmospheric pressure calculated using the Oxsol equation.
Units are ml/l. To compute mg/l, multiply the values in the table by 1.42903.
Oxsol: Oxygen Saturation Concentrations in Fresh and Ocean Water (ml/l)
Salinity (PSU) Temperature
(°C)
0 5 10 15 20 25 30 32 35
-2 10.84 10.46 10.10 9.74 9.40 9.07 8.75 8.63 8.45
0 10.23 9.88 9.54 9.21 8.90 8.59 8.30 8.18 8.01
2 9.68 9.35 9.04 8.73 8.44 8.15 7.88 7.77 7.61
4 9.17 8.87 8.58 8.29 8.02 7.75 7.49 7.39 7.24
6 8.71 8.43 8.15 7.89 7.63 7.38 7.14 7.05 6.91
8 8.29 8.02 7.77 7.52 7.28 7.04 6.82 6.73 6.60
10 7.90 7.65 7.41 7.18 6.95 6.73 6.52 6.44 6.31
12 7.54 7.31 7.08 6.86 6.65 6.45 6.25 6.17 6.05
14 7.21 6.99 6.78 6.57 6.37 6.18 5.99 5.92 5.81
16 6.91 6.70 6.50 6.31 6.12 5.93 5.75 5.68 5.58
18 6.62 6.43 6.24 6.06 5.88 5.70 5.53 5.47 5.37
20 6.36 6.18 6.00 5.82 5.65 5.49 5.33 5.27 5.17
22 6.12 5.94 5.77 5.61 5.45 5.29 5.14 5.08 4.99
24 5.89 5.72 5.56 5.41 5.25 5.10 4.96 4.90 4.82
26 5.68 5.52 5.37 5.22 5.07 4.93 4.79 4.74 4.66
28 5.48 5.33 5.18 5.04 4.90 4.77 4.63 4.58 4.51
30 5.29 5.15 5.01 4.87 4.74 4.61 4.49 4.44 4.36
32 5.11 4.98 4.84 4.71 4.59 4.46 4.34 4.30 4.23
References
Carritt, D.E. and J.H. Carpenter. 1966: Comparison and evaluation of currently employed modifications of the
Winkler method for determining dissolved oxygen in seawater. J. Mar. Res. 24(3), 286-318.
Clesceri, L.S. A.E. Greenberg, and R.R. Trussell ed. 1989, Standard methods for the examination of water and
wastewater, 17th edition, American Public Health Assoc. Washington D.C. ISBN 0-87553-161-X.
Gnaigner, E., and H. Forstner, Ed., 1983: Polarographic Oxygen Sensors: Aquatic and Physiological Applications,
Springer-Verlag, 370 pp.
Millard, R, C., Jr., 1982: CTD calibration and data processing techniques at WHOI using the 1978 practical salinity
scale. Proc. Int. STD Conference and Workshop, La Jolla, Mar. Tech. Soc., 19 pp.
Owens, W.B., and R.C. Millard Jr., 1985: A new algorithm for CTD oxygen calibration. J. Physical Oceanography,
15, 621-631.
Garcia and Gordon (1992) "Oxygen solubility in seawater: Better fitting equations", Limnology & Oceanography,
vol 37(6), p1307-1312.
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