I was involved in an argument at work today about the horrible, horrible poison I was ingesting – namely, diet soda. You see, apparently potassium benzoate is just another name for benzene, and we all know that benzene causes cancer! Right, so, obviously I’m not a total moron and I didn’t fall for it. But in poking around, there may be a nugget of truth in the mountain of horseshit.
Here’s what I’ve been able to figure out might be going on:
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Potassium/sodium benzoate, by itself, becomes benzene when exposed to heat and light. The amounts used in soft drinks are negligible and pose no threat.
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Potassium/sodium benzoate becomes benzene when exposed to heat and light in the presence of vitamin C (citric or ascorbic acid). Again, negligible in soft drinks, no threat.
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It’s the end of the world, don’t drink soft drinks! THEY are out to KILL YOU ALL!
I’m curious from a chemistry point of view which is accurate. I know my idiot coworker is wrong – if nothing else, I can rely on the fact that she thinks iodized salt will poison your thyroid as evidence of her stupidity – but I don’t know exactly what happens. And the stuff on the net is just varied enough that I can’t quite filter it for myself. (I’m ignoring the obviously biased sites, but even sticking to reasonable-sounding ones, I’m not sure what’s actually going on here.)
Can the Dope straighten me out?