Answer 1:
That sure sounds like an interesting project! Unfortunately I am not aware of simple techniques to measure the amount of oxygen in water. I do know that the solubility of oxygen is pretty low. For instance at room temperature there is only about 10 mg of oxygen per 1 liter of water. You can check out this website for more information about predicting the amount of dissolved O2 in water:
oxygen_in_water
Also, there are other factors that can contribute to the corrosion of pipes which may be interesting to consider. Here is an article discussing pipe corrosion:
corrosion pipes
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