Storage of elemental iodine?

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Joe Mama

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Apr 14, 2014, 4:09:31 AM4/14/14
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Lack of preparedness, a general tendency to overreact to the slightest chance of danger, and graveyard shift has landed me in quite a situation.

After isolating iodine from KI, decanting/filtering, and realizing my yield was much higher than expected, I was left with about 20 grams of iodine that I had no immediate use for. After some frantic reading, and realizing that I was in over my head as far as available storage vessels, I redissolved what was still drying back into 70% isopropyl alcohol to avoid sublimation, (Which, at the time, I was irrationally afraid of potential health risks.)

So now I'm faced with two dilemmas:

1) What is an appropriate containter to store ~20 grams of elemental iodine for up to 6 months in that won't contaminate everything in the refrigerator?
2) Am I safe in trying to re-extract from the isopropanol, or should I "scrap" it and start anew?

The Home Scientist

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Apr 14, 2014, 7:20:38 AM4/14/14
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It's traditional to store iodine and iodine solutions in brown glass bottles with tight-fitting caps, ideally with phenolic cone liners. Most plastics are permeable to iodine vapor. One exception is PET, used for soft-drink bottles. If I were you, I'd store the iodine solution in an empty, clean soft-drink bottle with the cap screwed down tightly. PET is resistant to isopropanol and iodine, and is not permeable to iodine vapor.

Also, there's no need to store the solution (or crystals) in the refrigerator. You should keep the iodine away from food, drink, and other consumables.

As far as re-extracting the iodine from the IPA solution, it's a pain in the butt because the iodine wants to sublime when you evaporate the IPA, but it can be done safely.
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