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Like hypochlorite and permanganate, persulfate increases the ORP of aquarium water in a repeated dose dependent manner (but less).I am waiting to see what @taricha finds when he doses persulfate to a water sample.
The effect from strongest ORP move to least is bleach > permanganate > persulfate.
Each of the first 3 humps is an addition of +5ppm sodium persulfate, the fourth hump is +10ppm.
It seems peroxide is unique in that it simply does not interact with the ORP probe itself, so we only detect it indirectly by what it does to other things.