An appropriate replacement for oxygen in water

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Modeling the behavior of oxygen in water presents challenges due to its low solubility, with concentrations around 8.3 ppm at standard temperature and pressure. Experimental measurement of oxygen can be achieved through methods like the Winkler Method or using electrochemical sensors. For those seeking alternatives, the discussion suggests finding a gas that is more soluble in water and similar in size to O2. This can facilitate easier experimental measurement while still allowing for relevant modeling of gas behavior in aquatic environments.
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I am trying to model the behavior of oxygen in water. However there is so little oxygen in water I don't think I could measure concentrations of it experimentally.

Does anyone have advice on what I might be able to use as a replacement for oxygen?

I need to find something (a gas?) that is more soluble in water then oxygen, which is of similar size to O2, which I can more easily measure experimentally.

Thanks!
 
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