Iodine Extraction (Finally! Povidone-iodine extra)

[Martian_A]

I have extracted Iodine using Navarone's extraction technique doing the following: Small pot, used glass lid, tooked off the knob (screw). Put the h20/pv i2 into pot. boiled. using homemade liebig condenser, a funnel & pvc tubing, I attached and airtight the 3, and turn up the heat. As most vapour was escaping *noticed the walls* I now relise i must make a more efficient gizmo.

However, the I2 crystals forming inside the liebig, was washed out using dh20 and put into a bottle.

Ive noticed leaving I2 in water, eventually it will disolve, why? maybe the outside climate. Im no scientist. I am wondering though I have frozen the dh20 with I2 crystals floating *frozen now*. Will I have any issues with it subliming when i take out the bottle to defrost? Is this technique fine as Im only able to grab little amounts of i2 at a time. Will the quality of the I2 weaken?

- Martian_A

[12cheman12]

Well Povidone makes I2 soluble in water, so my guess is that these I2 crystals maybe had small traces of Povidone left? Maybe not?.

But dont leave you I2 in water, dry it out completly by squeezing it tightly inbetween paper towels and put in an airtight container. Maybe with some salts to dry it out even more.

[wareami]

Martian_A: Nice Follow Up and report on Navarone's write-up.

I searched early on for specifics about I2 solubility in h2o and always came away with nothing more than "very slight" as the answer.
I felt very slighted by that answer
So wonder know more!
From Merck 6th ed.

Iodine. I; at. wt. 126.91; at. no. 53; valence 1-7. Discovered in 1811 by Courtois. Extracted from Chilean nitrate-bearing earth (caliche) or from seaweed.

Bluish-black scales or plates; metallic luster; characteristic odor; sharp, acrid taste. Its vapor is violet and corrosive. d. 4.93. m. 113.5°, but volatile at ordinary temps. b. 184.4°. Vapor pressure: 0.030 mm. at 0°; 0.131 mm. at 15°; 0.469 mm. at 30°; 2.154 mm. at 50°; 26.78 mm. at 90°. One gram dissolves in 2950 ml. water, 12.5 ml. alcohol, 4 ml. carbon disulfide, 10 ml. benzene, 53 ml. carbon tetrachloride, 80 ml. glycerol; soluble in chloroform, ether, glacial acetic acid, freely in soln. HI or iodides. Solubility in water increased by alkali bromides, but decreased by sodium or potassium nitrate or sulfate. Attacks metals in presence of moisture and slowly acts on organic tissue. Keep tightly closed.

Incompat. Oil: turpentine, starch, tannin, alkalies, alkaloids, metallic salts.

Use: Manuf. iodine compds., germicides, antiseptics; process engraving lithography, photography; an important reagent in anal. chemistry.

Grades available: Reagent, U.S.P., technical.

Med. Use: Skin disinfectant; for hyperthyroidism and simple colloid goiter. Toxicity: Usually amounts of 2 to 3 g. are fatal. Contraindications: Intern. in TB.

Caution: May cause iodism. Dose: Disinfectant: tincture 2% iodine and 2.4% sodium iodide, strong iodine tincture 7 % iodine, 5 % potassium iodide. Hyperthyroidism: Lugol's soln. 5% iodine and 10% potassium iodide.

Vet. Use: As Med. Use. Counterirritant in glandular hypertrophy. Bursal enlargement.