Add a small amount of peroxide
What is a small amount?
Isn't H2O + SO3 = H2SO4, which is sulfuric acid?
Wine adds has a calculator: http://www.wineadds.com/ (no affiliation)
sorry, it was a typo and should read SO4, however, the point is the same. I cant comment on it turing into sulfuric acid (as I dont know the science well enough),however, i do know that lots of places in the world allow winemakers to use H2O2 in wines.
My best guess would be that the H2SO4 created is so small that it does not pose a risk ut that is just a guess.
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