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Search literature sources with regards as to whether when measuring dissolved oxygen (in mg/L) in hydrogels,...

Search literature sources with regards as to whether when measuring dissolved oxygen (in mg/L) in hydrogels, what is it relative to? Is it relative to the oxygen in air or is it relative to the saturated concentration of oxygen in water for example? When measuring dissolved oxygen in hydrogels, what are they measuring against? Give at least 2 to 3 sources to support your statement.

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