What's the concentration of low partial pressure oxygen (0.1 MPa O2 partial pressure ) in subcritical water (8 MPa total pressure) from 50°C to 250°C?

Question

In a closed system, we pressurize and heat up the autoclave half filled with water to 8MPa with 99% CO2 and 1% O2, I wonder how much O2 is dissolved in water at different temperatures in a range from 50°C to 250°C.

Answer 1

You might want to consider looking at Henry's Law which relates the solubility of a gas to the partial pressure at a given temperature. C = kP where C = concentration of gas; k = Henry's constant and P = partial pressure of the gas.

You would have to look up k for each temperature of interest and solve for C in the equation.