Xylem WQ-FDO OPTICAL DISSOLVED OXYGEN TRANSMITTER Instrukcja Użytkownika Pobierz pdf (Strona 10)

Global Water

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equations done by R.F. Weiss in 1970 and are generally considered to be a

standard. These table entries will need to be corrected for salinity in the same way

as the concentration above. Find the correction value from Tables 7.1 to 7.4.

Multiply the oxygen solubility from tables 6.1 – 6.4 by the correction value to

obtain the adjusted solubility.

An equation can also be used, which is based on the work done by Weiss. To find

the solubility, use the following equation which has been corrected for altitude and

salinity:

Solubility of Oxygen in Water (100% Saturation):

c = EXP(A + B*100/(T+273.15) + C*LN((T+273.15)/100) + D*(T+273.15)/100

+ S*(E + F*(T+273.15)/100 + G*((T+273.15)/100)^2))*H*P

Where:

c = Solubility of O2 in mg/L corrected for salinity, temperature and pressure

T = Temperature in ºC

S = Salinity in PSS

a = Atmospheric pressure in mbar

And:

A = -173.4292

B = 249.6339

C = 143.3483

D = -21.8492

E = -0.033096

F = 0.014259

G = -0.001700

H = 0.00140934

Percent Oxygen Saturation:

S = (C / S

c) * 100

Where:

S = Oxygen percent saturation (%) of water sample

C = Concentration adjusted for salinity as calculated above

Sc = Corrected solubility as calculated above, or from tables

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Xylem WQ-FDO OPTICAL DISSOLVED OXYGEN TRANSMITTER Instrukcja Użytkownika Strona 10