It reacts with ozone to produce oxide reacts with fluorine, chlorine and bromine respectively to produce fluoride, chloride and bromide reacts with ammonia n to produce explosive triiodide reacts with platinum only at high temperatures reacts with zirconium to produce volatile zirconium tetrachloride. Iodine cannot be directly combined with carbon, nitrogen or oxygen. As iodide is very unstable, disproportionation occurs to get iodate and iodide. The solution is a weak acid, and the alkali can promote hydrolysis of it. Iodine is slightly soluble in water, but soon it hydrolyte. In the solvent with non-polarity or low polarity, solvation doesn’t exist, so the solution color is the same as iodine vapor. The different color of the solution is due to the solvation of the solvent molecules combined with iodine with coordination bond. If dissolved more in ethanol, the color is brown. If dissolved in solvent with a higher polarity, such as water, it was light brown. It is always a diatomic molecule in different polar solvents, such as carbon tetrachloride, trichloromethane and ethane. Iodine is soluble in organic solvents, and the color of solution is purple, the same as gaseous iodine. Iodine precipitates in the cathode when iodine acetate solution is electrolyzed, which prove that iodine has positive charge. Iodate that has been known so far includes iodine iodide, iodic acid perchlorate and iodine acetate and so on. It exists in the form of NaIO3 and Ca (IO3) 2. There is a lot of iodine in the seaweed, but iodine is mainly from Chilean nitrate. There is a small amount of iodide ion in the seawater, and the content is 50mg in 1t seawater. The content of iodine in the crust is 3 × 10-5%. Gailsacker named it iodine which derived from the Greek ioeides, and originally intended as “purple”. Gailusak later, and they pointed out that the new element does exist. The discovery elucidated the physical properties of iodine. Kurtwa found that after extraction of potassium carbonate from the roasted seaweed, the remaining mother liquor added sulfuric acid produced violet steam with heating, and then it condensed into brilliant flaky crystals.
It sublimates slowly to obtain gaseous toxic iodine that has a purple color and irritating smell. Iodine is a shiny crystal with the color of atropurpureus. The common oxidation states of iodine in the compounds are-I (iodide), + Ⅴ (iodate), + Ⅶ (periodate). Some data about it are as follows: Atomic number 53 atomic weight 126.9044 electronic configuration 2,8,18,18,7 relative density 4.93 melting point 113.5 ℃and boiling point 184 ° C. It has radionuclides of 123 iodine, 125 iodine and 131 iodine respectively. Iodine is a non-metallic element in the main group Ⅷ of the periodic table, and the symbol is I. Iodine is the second halogen element which was found after chlorine. Indirect Additives used in Food Contact Substances Miscible with chloroform, carbon tetrachloride, carbon disulfide, cyclohexane, methanol, ethyl acetate, toluene, benzene, n-hexane, butan-2-ol, bromoethane, n-heptane, glycerol and diethyl ether.
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