Gas solubility in water

Good morning,
I know that Henry's law describes the gas solubility in water with partial pressure of a specific gas.
For example the oxygen concentration in water, under atmospheric pressure, is

$\mathrm{C = P_{O_2} * k}$, where $\mathrm{P_{O_2}}$ is $\mathrm{0.21}$ bar.

But if I have a steam-water mixure, how I can calculate the solubility (for example in a deaerator)?
What data I need to calculate that solubility?
Thanks

• Why do you feel that you can't use Henry's law for this? – Chet Miller Jan 30 '17 at 12:46
• Well if you are constantly deaerating, then then you are not at equilibrium with air (oxygen = 0.21 bar). The equilibrium would be with the small amount of oxygen in the deaerator, but presumably your goal is to approach "zero" oxygen. – airhuff Jan 30 '17 at 20:26
• If that's the case, I don't think we have enough data to solve for such a dynamical system. – Zhe Jan 30 '17 at 23:35