99.999% pure?
Certainly not JUST Butane….
The above should be ~10ppm. It’s not. but it does give me a ballpark to aim at 
Not the right heat source, but will work for initial method development.
If the solvent peak is higher that the “terpene” peaks, it’s not ready…
Of course the area for those other volatiles is very much dependent on the temp the vial is sampled…and that coffee warmer isn’t doing me any favors.