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Author: Subject: Iodine storage
reactofurnace
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[*] posted on 6-5-2022 at 06:04
Iodine storage


Is it possible to store iodine in warm-hot weather (28-30C)? I'm planning to prepare some for a reaction and was wondering if such temperatures can cause the iodine to sublimate over several days.
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Texium
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[*] posted on 6-5-2022 at 08:02


Depends on what you’re storing it in. Ampouled? No problem. Vial with Teflon lined lid? Probably fine, as long as it’s not for too long. Put it in a secondary jar with some sodium hydroxide pellets for extra insurance, if you want to. Anything less than that will very likely leak at those temperatures.



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Sulaiman
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[*] posted on 6-5-2022 at 09:55


The vapour pressure of iodine is quite low, (<0.1 Atm. @ 50C)
So the main concern is the chemical compatibility of the cap liner with iodine.
For hours or days even coated paper will survive,
Foam polyethylene liners will survive at least for months.




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Lion850
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[*] posted on 6-5-2022 at 21:18


I have iodine that has been in my shed in a dark glass bottle with plastic cap (not sure what kind of plastic) for a few years, and in summer shed often gets to over 40C. Put the glass bottle in a zip lined clear plastic bag then you can easily see how much escapes (seems a bit always does!).
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[*] posted on 15-7-2022 at 13:33


My Iodine has broken out (vapors) of the jar and into at least one of the layered bags i have around it, turning it purple.
Its over long time though but its quite good at escaping containers.
Sealed glass ampoules would be best and 100% leak free, one can make them from test tubes.
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[*] posted on 16-7-2022 at 09:13


I prepared this I2 from KI and dried it over vacuum. I haven't had appreciable loss from this screw top vial for months at an ambient of around 30C.

i2.jpeg - 11kB




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Tsjerk
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[*] posted on 16-7-2022 at 14:43


My iodine has been stored like this for 15 years, I haven't noticed anything leaking. I don't know what the cap is made off, but there is some grease on the inside. Temperatures uncontrolled, between -10 and +30 I guess.


PXL_20220716_223833994.jpg - 1.9MB

[Edited on 16-7-2022 by Tsjerk]
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UC235
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[*] posted on 17-7-2022 at 08:33


I just keep mine in the freezer. Basically no volatility.
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Lion850
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[*] posted on 17-7-2022 at 19:10


I'm with Tsjerk....just stored in a jar, and never noticed leaks. In my shed it gets around 50C in summer. Also, I received iodine from Chine twice and it comes in a simple zip lock back in a padded envelope.

On the other hand, the supplier I know in Brisbane stored their bottles of iodine inside a zip lock bag.
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valeg96
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[*] posted on 4-11-2022 at 11:56


I have some iodine from the 1950s and a simple glass reagent bottle with a lined hard plastic screw cap is enough. Even the old ones with a cork/oiled paper liner under the cap seem to hold it fine. It will be absorbed into the plastic but not leak. Just no food containers or metal caps.




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