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overseer
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storing iodine
The crystalline iodine is best stored in tightly closed glass containers, of very small dimensions, such as the one shown in this picture I took. The
commercial resublimed iodine (if You happen to own some) is so pure that it should not be removed from original packaging, except for the amounts that
You immediately need. Small quantities can, however, always be kept close at hand, in a very small, all glass, tightly closed container (picture). In
this manner, although some iodine inevitably evaporates, there's little space for the vapor to fill, so You don't lose much of it. Note that
iodine sublimes on the bottle neck, which entirely changed its color to brownish-yellow.
It is not advisable to mix it with water or anyhing else for storage (especially not the resublimed, purified form) as it is usually required pure and
dry when measuring its quantities as a reagent.
Plastic bags are super-useless for storage, as they either let iodine through, or can react with it. I've seen a storage site where people used
to put a cracked iodine bottle in a ziploc bag - a few months later, the space around the bag was all brownish-yellow and filled with little iodine
crystals. So, don't try to use any plastic containers or plastic/rubber stoppers. Some people tend to think rubber makes a good stopper, but this
is even less so. I've even seen a bottle of butanol, sealed with a rubber stopper, in which the rubber melted and went down the bottle walls
right into the liquid. Good storage practice is generally a serious issue.
Opening a bottle of iodine so small as the one depicted here is fairly easy, even after a while. However, if the stopper won't come out usual
techniques can help: hitting the bottle neck lightly against the edge of a wooden table, or gently heating the neck on a flame: the heat warms the
exposed neck first, causing it to expand more than the stopper inside, which in turn can help opening the bottle. However, *do not use glycerine* or
other agents which are sometimes useful on stuck glass stoppers.
[Edited on 18-6-2005 by overseer]
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Researcher88
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storing
I store my iodine in a small jointed tube with a tight glass stopper. The iodine is then put into the freezer. To observe if any losses is present, I
wrapped tissue paper around the container, waiting for few months seeing if any yellow stains appear on the tissue. I have not experienced yellow
stains in a month.
[Edited on 15-7-2005 by Researcher88]
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Skitz
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Storing iodine
Wrap iodine bottle in tissue paper, put inside larger jar, seal & burry outside to keep cool.
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Fleaker
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This bottle is great for storing bromine or iodine. Shame they are so expensive.. A bottle like this would hold about 400 grams of iodine maybe more
depending on how compressed it is. The PTFE stopper is a nice touch because bromine and iodine destroy rubber and standard issue phenolic
stoppers/caps.
http://www.enasco.com/prod/ProductDetail?sku=SB28808M&ti...
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praseodym
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Iodine topical solution should be stored in light-resistant containers at a temperature not exceeding 35 °C and iodine tincture should be stored in
air-tight containers.
Hence, i recommend that you get an air-tight container and wrapped it yourself with black paper and place it in a dry, cool area.
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MagicJigPipe
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Glass vial, glass or teflon stopper + as cold as you can keep it. I have found that to be the best way. I have noticed only minimal sublimation no
more than a few milimeters from the I2 sample. Although my freezer goes down to -30*C.
I'm trying to obtain a dry ice freezer. That would be perfect! In theory I could store I2 and solid Br2 with minimal sublimation/evaporation.
Although the solid Br2 might be difficult to store as solid... Something to think about though...
One could even store small amounts of liquid NH3 for short periods of time (you won't see me doing this, however). I'm going to ask around the local
grocery stores to see if anyone is getting rid of one.
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