Dont worry that is misinterpretation/exageration. I mean, first of all, you shouldnt have any sodium carbonate migrate to your non-polar at all! It will definitely not dissolve in your solvent, just like lye wont, they are way too polar. Secondly, even if it did come across through bad manual separation, a simple wash would easily eliminate it. Didnt you notice that sodium carbonate is used for washing any possible lye traces from solvents?
Any possible trace of sodium carb would be insignificant after washing.
Also, sodium carbonate does not vaporize at lighter temperatures. At most it might come suspended in unvaporized particle, but the quantity should be insignificant anyways (same with lye, which would be even worse, so I fail to see why you think sodium carbonate would be bad in a way that lye wouldnt?). Smoke it in a water bong or wash your solvent before retrieving your crystals (and be careful with separation of layers) and there is no danger at all.
Illerrre, there isn't any real information regarding what it contains in what you wrote. You also didnt write the brandname... In any case I ran a search on this phrase "crescendo a seu lado" (growing next to you), and I saw that its from LACRILAR brand, is that right? Ive sent them an email asking if they have a certificate of analysis of their product, saying I wanted to use it for conserving olives and didnt want to ingest anything toxic so I wondered what the 2% was. ill let you know when there is any answer.