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Iodine

Expensive Compound!

Iodine may be disposed in a separate bottle. Since it is very expensive you should try to find a subsequent user instead.

Iodine with poor quality may be purified by sublimation. If this is too much effort if you are doing a research job, maybe this could be performed as an extra-experiment in a lab-course?

Small quantities typical for lab work may be reduced with sulfite and then flushed down the drain.