[PierreARM]

I hope i'm posting this in the right section.
First the setup:
A sample of gas containing an unknown mix of H2SO4 mist, SO3 and SO2 is sampled and bubbled through an 80% isopropyl solution, then through a filter and then bubbled again through a solution of H2O2. The solutions are kept in ice bath so temperature anywhere between 5 and 15C. Gas sampled anywhere between 45 and 300C , filter kept at ambient temperature.

Ideally this setup should allow the SO2 through to the H2O2 while keeping the H2SO4 and SO3 away. From what i understand (which could be wrong), the SO2(g) reacts with the hydrogen peroxide to form H2SO4, SO3(g) dissolves straight away to form H2SO4 in the first solution. Final result should be sulfate ions from sulfuric acid mist and SO3 "locked" in the first solution and sulfate from SO2 in the second solution.

Here are the questions:
-what's the role of the isopropyl in this? does it react with H2SO4 (mist and SO3-born)? would it be a standard dehydration of the alcohol? Technically both SO2 and SO3 dissolve in water so how can either get past the first solution? If 80% isopropyl is enough to prevent dissolution then what happens to SO3?

Apologies for the barrage of questions (and the answers are probably so simple i'll kick myself) but any information would be more than welcome.

Cheers!
P.