Not to go into a long discussion around chemistry, toxicology or cancer I'll just provide the data around melting point.
Sodium nitrite | 7632-00-0 - chemical and physical properties, structure, melting point, boiling point, density, molecular formula, molecular weight, uses, prices, suppliers, and toxicity/safety/hazards/SDS information.
www.chemicalbook.com
Interesting read, but I have thoughts. I’ll try not to complicate the discussion and use as much brevity as possible.
The chemical process that takes place when curing meat is not fully understood, other than we know some basic things and the final results. It’s actually pretty complicated but I won’t try to wade into all that. However, I don’t believe that in curing we are talking about nitrite specifically. That’s what we start with but some chemistry has to happen to effect the curing process.
Here is what happens,
Cure #1 (NaNo2) becomes HNO2 (nitrous acid) this is what is believed to interact with bad bacteria and neutralize it.
The HNO2 then breaks down to NO (nitric oxide) this is what binds with meat myoglobin and fixes the pinkish red color in cured meats.
So how does NaNo2 convert to HNO2? Well interesting enough this happens when we mix H2O with it. (NaNo2 + H2O= HNO2 + OH) (hydroxide)
Now meat is about 75% water, so when we mix curing salt with meat this reaction with water starts the conversion process I just described. (This is how I understand it)
So by mixing NaNo2 into brine (mostly H2O) I have to believe that this conversion starts, at what rate? I don’t know, but now we are talking about chemical conversion to nitrous acid. Now nitrous acid is not stable, and I believe can and is effected by heat, low level heat~ 130* or so increases the conversion to nitric oxide (gas).
Its all more complex than this, but goes back to what I stated earlier, I don’t believe we are only talking about nitrite and I don’t believe that the melting point of nitrite has anything To do with what chemical changes are taking place. If mixing curing salt with water created nitrous acid, and heat accelerates the transformation into nitric oxide, the yes, boiling the brine will in fact gas off a certain portion of the cure. How much is anybodies guess. Could be a lot or a little. Bottom line is don’t boil curing salt. Add it after the brine has cooled.