Degassing wine

[reefman]

I was watching some you-tube videos the other day and I ran across one on degassing.
I always thought that we were removing CO2 when degassing, but this video said that the small bubbles that exit the wine first are sulfur dioxide gas bubbles. The bigger bubbles that exit after the SO2 are the CO2 gas bubbles.
What's the real story?

 

[dcbrown73]

I'm not chemist, but while SO2 can and does get released, but that is the SO2 that you add to the wine.

Most of the degassing is releasing CO2 that is built up from the fermentation process. If it was SO2 that was being released during the degassing, it would stink much worse!