i assume you mean Na(NO2).
The grade of SN doesn't mean anything because it is the Moles of SN that actually kill you. I'm a chemist, not a biologist, so i couldn't tell you how to do it.
Before you consider this action, please exhaust all available resources on recovery. As cheesy as it sounds, im sure there will be people who will miss you. Life is full of (bad) surprises, you never know.