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Where to get manganese dioxide?


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The material from batteries (only zinc/carbon batteries are OK) is VERY impure. It is mixed with carbon and possibly other crap. Besides that, it is extremely messy and dirty.


A much better source are the ceramics and potteries suppliers. These sell MnO2 at reasonable (certainly not reagent grade) purity, suitable for most home experiments.

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I agree with John, it is true for any manganese compound (remember, all manganese compounds easily are oxidized to either +2 or +4 oxidation state, depending on pH).

On the other hand, if you have an occasional exposure, due to experimenting with MnO2, then in a practical sense I agree with YT.

I myself sometimes experiment with manganese compounds and I take the usual precautions, but do not treat it in a special way as a highly toxic chemical. But if I had to work in a place with manganese around 5 days per week, then things would be another matter.

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Every chemical we work with has the potential to be toxic for us. Hell, a recent radio station contest that went wrong proved that plain old H2O can be toxic to us. A simple use of good chemical hygene, common sense, and paying attention will keep you good and safe for a long, long time.


This is MnO2 we're talking about, not KCN, Ni(CO)4, AsH3, etc.

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I'm not saying that the stuff is hugely toxic. I just think it's plain dumb to make a statement like "No, it's not toxic" when, in fact, it is toxic. This is meant to be a scientific forum. Plainly inaccurate postings like that serve no purpose, worse they may persuade some fool to ignore the toxic nature of Mn compounds and harm themselves. You may wish to disregard those people as candidates for a Darwin award, but that's not a point I'd like to have to argue with their family or their lawyer.


As for this comment "john, that refers to manganese metal, not its dioxide."

What are you talking about? Do you really believe that Mn wouldn't get oxidised in the body? Do you really think that MnO2 wouldn't get reduced? Don't you understand that the toxicity refered to in the Wiki article is about welding fumes? Do you think those fumes are the metal rather than its oxide(s)?

If anything the higher oxidation states are likely to do more damage.


The comment "MnO2 isn`t going to cause ANY harm :)" is simply at odds with the facts; Mn has caused harm and it probably will again.

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