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20-September-2008 09:29:05 - Iodine For other uses, see Iodine disambiguation. 53 tellurium â†? iodine → xenon Br ↑ I ↓ At Periodic Table - Extended Periodic Table General Name, Symbol, Number iodine, I, 53 Element category halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Standard atomic weight 126.904473 g·mol-1 Electron configuration Kr 4d10 5s2 5p5 Electrons per shell 2, 8, 18, 18, 7 Physical properties Phase solid Density near r.t. 4.933 g·cm-3 Melting point 386.85 K 113.7 °C, 236.66 °F Boiling point 457.4 K 184.3 °C, 363.7 °F Triple point 386.65 K, 12.1x103 Pa Critical point 819 K, 11.7 MPa Heat of fusion I2 15.52 kJ·mol-1 Heat of vaporization I2 41.57 kJ·mol-1 Specific heat capacity 25 °C I2 54.44 J·mol-1·K-1 Vapor pressure rhombic PPa 1 10 100 1 k 10 k 100 k at TK 260 282 309 342 381 457 Atomic properties Crystal structure orthorhombic Oxidation states ±1, 5, 7 strongly acidic oxide Electronegativity 2.66 Pauling scale Ionization energies 1st: 1008.4 kJ/mol 2nd: 1845.9 kJ/mol 3rd: 3180 kJ/mol Atomic radius 140 pm Atomic radius calc. 115 pm Covalent radius 133 pm Van der Waals radius 198 pm Miscellaneous Magnetic ordering nonmagnetic Electrical resistivity 0 °C 1.3×107 Ω·m Thermal conductivity 300 K 0.449 W·m-1·K-1 Bulk modulus 7.7 GPa CAS registry number 7553-56-2 Selected isotopes Main article: Isotopes of iodine iso NA half-life DM DE MeV DP 127I 100% 127I is stable with 74 neutrons 129I syn 15.7×106y β- 0.194 129Xe 131I syn 8.02070 d β- 0.971 131Xe References Iodine IPA: /ˈaɪədaɪn, ˈaɪədɪn/, or /ˈaɪədiË?n/; from Greek: ιώδης iodes violet, is a chemical element that has the symbol I and atomic number 53. Naturally-occurring iodine is a single isotope with 74 neutrons. Chemically, iodine is the least reactive of the halogens, and the most electropositive halogen after astatine. However, the element does not occur in the free state in nature. As with all other halogens members of Group VII in the Periodic Table, when freed from its compounds iodine forms diatomic molecules I2. Iodine and its compounds are primarily used in medicine, photography and in dyes. Although it is rare in the solar system and Earth's crust, the iodides are very soluble in water, and the element is concentrated in seawater. This mechanism helps to explain how the element came to be required in trace amounts by all animals and some plants, being by far the heaviest element known to be necessary to living organisms. Contents 1 Properties 2 History 3 Applications 4 Occurrence on earth 5 Sources 6 Descriptive chemistry 7 Notable inorganic iodine compounds 8 Stable iodine in biology 8.1 Human dietary intake 8.2 Iodine deficiency 9 Radioiodine and biology 9.1 Radioiodine and the thyroid 9.2 Radioiodine and the kidney 10 Isotopes 11 Toxicity of iodine 12 Precautions for stable iodine 13 Clandestine use 14 See also 15 References 16 External links Properties Iodine under standard conditions is a dark-purple/dark-brown solid. It can be seen apparently sublimating at standard temperatures into a violet-pink gas that has an irritating odor. This halogen forms compounds with many elements, but is less reactive than the other members of its Group VII halogens and has some metallic light reflectance. Elemental iodine dissolves easily in chloroform and carbon tetrachloride. The solubility of elementary iodine in water can be vastly increased by the addition of potassium iodide. The molecular iodine reacts reversibly with the negative ion, creating the triiodide anion, I3-, which dissolves well in water. This is also the formulation of some types of medicinal antiseptic iodine, although tincture of iodine classically dissolves the element in alcohol. The deep blue color of starch-iodine complexes is produced only by the free element. Students who have seen the classroom demonstration in which iodine crystals are gently heated in a test tube to violet vapor, may gain the impression that liquid iodine does not exist at atmospheric pressure. This misconception arises because the small amount of vapor produced has such a deep colour that the liquid appears not to form. In fact, if iodine crystals are heated carefully to just above their melting point of 113.7 °C, the crystals melt into a liquid which is present under a dense blanket of the vapor. History Iodine was discovered by Bernard Courtois in 1811. He was born to a manufacturer of saltpeter a vital part of gunpowder. At the time of the Napoleonic Wars, France was at war and saltpeter was in great demand. Saltpeter produced from French niter beds required sodium carbonate, which could be isolated from seaweed washed up on the coasts of Normandy and Brittany. To isolate the sodium carbonate, seaweed was burned and the ash then washed with water. The remaining waste was destroyed by adding sulfuric acid. One day Courtois added too much sulfuric acid and a cloud of purple vapor rose. Courtois noted that the vapor crystallized on cold surfaces making dark crystals. Courtois suspected that this was a new element but lacked the money to pursue his observations. However he gave samples to his friends, Charles Bernard Desormes 1777-1862 and Nicolas Clément 1779-1841, to continue research. He also gave some of the substance to Joseph Louis Gay-Lussac 1778-1850, a well-known chemist at that time, and to André-Marie Ampère 1775-1836. On 29 November 1813, Dersormes and Clément made public Courtois' discovery. They described the substance to a meeting of the Imperial Institute of France. On December 6, Gay-Lussac announced that the new substance was either an element or a compound of oxygen. Ampère had given some of his sample to Humphry Davy 1778-1829. Davy did some experiments on the substance and noted its similarity to chlorine. Davy sent a letter dated December 10 to the Royal Society of London stating that he had identified a new element. A large argument erupted between Davy and Gay-Lussac over who identified iodine first but both scientists acknowledged Courtois as the first to isolate the chemical element. Applications Iodine is used in pharmaceuticals, antiseptics, medicine, food supplements, dyes, catalysts, halogen lights, photography, water purifying, and starch detection. Tincture of iodine 10% elemental iodine in ethanol base is an essential component of any emergency survival kit, used both to disinfect wounds and to sanitize surface water for drinking 3 drops per litre, let stand for 30 minutes. Alcohol-free iodine solutions such as Lugol's iodine, as well as other iodophor type antiseptics, are also available as effective elemental iodine sources for this purpose. Iodine compounds are important in the field of organic chemistry Iodine, as a heavy element, is quite radio-opaque. Organic compounds of a certain type typically iodine-substituted benzene derivatives are thus used in medicine as X-ray radiocontrast agents for intravenous injection. This is often in conjunction with advanced X-ray techniques such as angiography and CT scanning Silver iodide is used in photography. Tungsten iodide is used to stabilize the filaments in light bulbs. Iodine crystals are used in the process to make NI3 or nitrogen triiodide. This compound is a shock-sensitive explosive when dry. It has commonly been used for pranks, but because of its extreme touch sensitivity, is not useful commercially. Occurrence on earth Iodine naturally occurs in the environment chiefly as a dissolved iodide in seawater, although it is also found in some minerals and soils. The element may be prepared in an ultrapure form through the reaction of potassium iodide with copperII sulfate. There are also a few other methods of isolating this element in the laboratory--for example the method used to isolate other halogens: oxidation of the iodide in hydroiodic acid often made in situ with an iodide and sulfuric acid by manganese dioxide see below in Descriptive chemistry. Although the element is actually quite rare, kelp and certain plants and algae have some ability to concentrate iodine, which helps introduce the element into the food chain. Sources Iodine output in 2005 Iodine output in 2005 Iodine is found in the mineral caliche, found in Chile, between the Andes and the sea. It can also be found in some seaweeds as well as extracted from seawater. Extraction from seawater involves electrolysis. The brine is first purified and acidified using sulphuric acid and is then reacted with chlorine. An iodine solution is produced but it is yet too dilute and has to be concentrated. To do this air is blown into the solution which causes the iodine to evaporate, then it is passed into an absorbing tower containing acid where sulfur dioxide is added to reduce the iodine. The solution is then added to chlorine again to concentrate the solution more, and the final solution is at a level of about 99%.citation needed Another source is from kelp. This source was used in the 18th and 19th centuries but is no longer economically viable. In 2005, Chile was the top producer of iodine with almost two-thirds world share followed by Japan and the USA, reports the British Geological Survey. Descriptive chemistry Elemental iodine is poorly soluble in water, with one gram dissolving in 3450 ml at 20 °C and 1280 ml at 50 °C. By contrast with chlorine, the formation of the hypohalite ion IO- in neutral aqueous solutions of iodine is negligible. I2+ H2O ↔ H+ + I- + HIO K = 2.0×10-131 Solubility in water is greatly improved if the solution contains dissolved iodides such as hydroiodic acid, potassium iodide, or sodium iodide; this extra solubility results from the high solubility of the I3- ion. Dissolved bromides also improve water solubility of iodine. Iodine is soluble in a number of organic solvents, including ethanol 20.5 g/100 ml at 15 °C, 21.43 g/100 ml at 25 °C, diethyl ether 20.6 g/100 ml at 17 °C, 25.20 g/100 ml at 25 °C, chloroform, acetic acid, glycerol, benzene 14.09 g/100 ml at 25 °C, carbon tetrachloride 2.603 g/100 ml at 35 °C, and carbon disulfide 16.47 g/100 ml at 25 °C.2 Aqueous and ethanol solutions are brown. Solutions in chloroform, carbon tetrachloride, and carbon disulfide are violet. Elemental iodine can be prepared by oxidizing iodides with chlorine: 2I- + Cl2 → I2 + 2Cl- or with manganese dioxide in acid solution:1 2I- + 4H+ + MnO2 → I2 + 2H2O + Mn2+ Iodine is reduced to hydroiodic acid by hydrogen sulfide:3 I2 + H2S → 2HI + S↓ or by hydrazine: 2I2 + N2H4 → 4HI + N2 Iodine is oxidized to iodate by nitric acid:4 I2 + 10HNO3 → 2HIO3 + 10NO2 + 4H2O or by chlorates:4 I2 + 2ClO3- → 2IO3- + Cl2 Iodine is converted in a two stage reaction to iodide and iodate in solutions of alkali hydroxides such as sodium hydroxide:1 I2 + 2OH- → I- + IO- + H2O K = 30 3IO- → 2I- + IO3- K = 1020 Notable inorganic iodine compounds HI He LiI BeI2 BI3 CI4 NI3 I2O4 I2O5 I4O9 IF IF3 IF5 IF7 Ne NaI MgI2 AlI3 SiI4 PI3 S ICl ICl3 Ar KI CaI2 Sc TiI4 V Cr MnI2 Fe Co NiI2 CuI ZnI2 Ga2I6 GeI2 GeI4 As Se IBr Kr RbI SrI2 Y ZrI4 Nb Mo Tc Ru Rh Pd AgI CdI2 InI3 SnI4 SnI2 SbI3 TeI4 I Xe CsI BaI2 Hf Ta W Re Os Ir Pt AuI HgI2 TlI PbI2 Bi Po At Rn Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Uub Uut Uuq Uup Uuh Uus Uuo ↓ La Ce Pr Nd Pm SmI2 Eu Gd TbI3 Dy Ho Er Tm Yb Lu Ac ThI4 Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr See also iodine compounds Stable iodine in biology Iodine is an essential trace element, the heaviest-known element needed by living organisms. Its only known roles in animal biology are as constituents of the thyroid hormones, thyroxine T4 and triiodothyronine T3. These are made from addition condensation products of the amino acid tyrosine, and are stored prior to release in a protein-like iodine-containing molecule called thyroglobulin. T4 and T3 contain four and three atoms of iodine per molecule, respectively. The thyroid gland actively absorbs iodide from the blood to make and release these hormones into the blood, actions which are regulated by a second hormone TSH from the pituitary. Thyroid hormones are phylogenetically very old molecules which are synthesized by most multicellular organisms, and which even have some effect on unicellular organisms. Thyroid hormones play a very basic role in biology, acting on gene transcription to regulate the basal metabolic rate. The total deficiency of thyroid hormones can reduce basal metabolic rate up to 50%, while in excessive production of thyroid hormones the basal metabolic rate can be increased by 100%. T4 acts largely as a precursor to T3, which is with some minor exceptions the biologically active hormone. Human dietary intake The United States Food and Drug Administration recommends 150 micrograms of iodine per day for both men and women.5 This is necessary for proper production of thyroid hormone.5 However the daily FDA intake recommendation may be 100x too low.6 Natural sources of iodine include sea life, such as kelp and certain seafood, as well as plants grown on iodine-rich soil.78 Salt for human consumption is often fortified with iodine and is referred to as iodized salt.8 Iodine deficiency Main article: Iodine deficiency In areas where there is little iodine in the diet-typically remote inland areas and semi-arid equatorial climates where no marine foods are eaten-iodine deficiency gives rise to hypothyroidism, symptoms of which are extreme fatigue, goitre, mental slowing, depression, weight gain, and low basal body temperatures.citation needed Iodine deficiency is also the leading cause of preventable mental retardation, a result which occurs primarily when babies or small children are rendered hypothyroidic by a lack of the element. The addition of iodine to table salt has largely eliminated this problem in the wealthier nations, but as of March 2006, iodine deficiency remained a serious public health problem in the developing world. 9 Radioiodine and biology Radioiodine and the thyroid Human exposure to radioactive iodine will cause thyroid uptake, as with all iodine, leading to elevated chances of thyroid cancer. Isotopes with shorter half-lives such as I131 present a greater risk than those with longer half-lives since they generate more radiation per unit of time. Taking large amounts of regular iodine will saturate the thyroid and prevent uptake. Iodine pills are sometimes distributed to persons living close to nuclear establishments, for use in case of accidents that could lead to releases of radioactive iodine. Iodine-123 and iodine-125 are used in medicine as tracers for imaging and evaluating the function of the thyroid. Noncombined elemental iodine is mildly toxic to all living things. The artificial radioisotope 131I a beta emitter, has a half-life of 8.0207 days. Also known as radioiodine, 131I has been used in treating cancer and other pathologies of the thyroid glands. 123I is the radioisotope most often used in nuclear imaging of the kidney and thyroid as well as thyroid uptake scans used for the evaluation of Graves' Disease. The most common compounds of iodine are the iodides of sodium and potassium KI and the iodates KIO3. Potassium iodide KI tablets, or SSKI = Saturated Solution of KI liquid drops can be given to people in a nuclear disaster area when fission has taken place, to block the uptake of iodine-131 by the thyroid. The protective effect of KI lasts approximately 24 hours, so it should be dosed daily until a risk of significant exposure to radioiodines no longer exists.1011 The exposure can be reduced by evacuation, sheltering, and by control of the food supply. Iodine-131 also decays rapidly, with a half-life of 8 days, so that 99.95% of the original radioiodine is gone after three months. Iodine-129 129I half-life 15.7 million years is a product of cosmic ray spallation on various isotopes of xenon in the atmosphere, in cosmic ray muon interaction with tellurium-130, and also and uranium and plutonium fission, both in subsurface rocks and nuclear reactors. Nuclear processes, in particular nuclear fuel reprocessing and atmospheric nuclear weapons tests have now swamped the natural signal for this isotope. 129I was used in rainwater studies following the Chernobyl accident. It also has been used as a groundwater tracer and as an indicator of nuclear waste dispersion into the natural environment. Radioiodine and the kidney In the 1970s imaging techniques were developed in California to utilize radioiodine in diagnostics for renal hypertension. Isotopes Main article: isotopes of iodine There are 37 isotopes of iodine and only one, 127I, is stable. In many ways, 129I is similar to 36Cl. It is a soluble halogen, fairly non-reactive, exists mainly as a non-sorbing anion, and is produced by cosmogenic, thermonuclear, and in-situ reactions. In hydrologic studies, 129I concentrations are usually reported as the ratio of 129I to total I which is virtually all 127I. As is the case with 36Cl/Cl, 129I/I ratios in nature are quite small, 10-14 to 10-10 peak thermonuclear 129I/I during the 1960s and 1970s reached about 10-7. 129I differs from 36Cl in that its halflife is longer 15.7 vs. 0.301 million years, it is highly biophilic, and occurs in multiple ionic forms commonly, I- and IO3- which have different chemical behaviors. This makes it fairly easy for 129I to enter the biosphere as it becomes incorporated into vegetation, soil, milk, animal tissue, etc. Excesses of stable 129Xe in meteorites have been shown to result from decay of primordial iodine-129 produced newly by the supernovas which created the dust and gas from which the solar system formed. 129I was the first extinct radionuclide to be identified as present in the early solar system. Its decay is the basis of the I-Xe Iodine-xenon radiometric dating scheme, which covers the first 83 million years of solar system evolution. Effects of various radioiodine isotopes in biology are discussed above. Toxicity of iodine Excess iodine has symptoms similar to those of iodine deficiency. Commonly encountered symptoms are abnormal growth of the thyroid gland and disorders in functioning and growth of the organism as a whole. Elemental iodine, I2, is a deadly poison if taken in larger amounts; if 2-3 grams of it are consumed, it is fatal to humans. Iodides are similar in toxicity to bromides. Precautions for stable iodine Direct contact with skin can cause lesions, so it should be handled with care. Iodine vapor is very irritating to the eye and to mucous membranes. Concentration of iodine in the air should not exceed 1 mg/m³ eight-hour time-weighted average. When mixed with ammonia, it can form nitrogen triiodide which is extremely sensitive and can explode unexpectedly. Clandestine use In the United States, the Drug Enforcement Agency DEA regards iodine and compounds containing iodine ionic iodides, iodoform, ethyl iodide, and so on as reagents useful for the clandestine manufacture of methamphetamine. Persons who attempt to purchase significant quantities of such chemicals without establishing a legitimate use are likely to find themselves the target of a DEA investigation. Persons selling such compounds without doing due diligence to establish that the materials are not being diverted to clandestine use may be subject to stiff penalties, such as expensive fines or even imprisonment.1213 See also Iodide as an antioxidant Chemical Oxygen Iodine Laser Nutrition facts label References ^ a b c Advanced Inorganic Chemistry by Cotton and Wilkinson, 2nd ed. ^ Merck Index of Chemicals and Drugs, 9th ed. ^ General Chemistry volume 2 by N.L. Glinka, Mir Publishing 1981 ^ a b General Chemistry by Linus Pauling, 1947 ed. ^ a b Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc 2000, Food and Nutrition Board FNB, Institute of Medicine IOM ^ Extrathyroidal Benefits of Iodine ^ International Council for the Control of Iodine Definiciency Disorders - Sources of iodine ^ a b MedlinePlus Medical Encyclopedia: Iodine in diet ^ Micronutrients - Iodine, Iron and Vitamin A. UNICEF. ^ Frequently Asked Questions on Potassium Iodide KI ^ Potassium Iodide as a Thyroid Blocking Agent in Radiation Emergencies ^ 21 USC Sec. 872 01/22/02 ^ Chemical Supplier Convicted of Diversion of Iodine External links Wikimedia Commons has media related to: Iodine Look up iodine in Wiktionary, the free dictionary. Micronutrient Research for Optimum Health, Linus Pauling Institute, OSU Oregon State University ATSDR - CSEM: Radiation Exposure from Iodine 131 U.S. Department of Health and Human Services public domain ChemicalElements.com - Iodine who.int, WHO Global Database on Iodine Deficiency Network for Sustained Elimination of Iodine Deficiency Oxidizing Agents Iodine Los Alamos National Laboratory: Iodine e v d e Diatomic chemical elements Hydrogen H2 | Nitrogen N2 | Oxygen O2 | Fluorine F2 | Chlorine Cl2 | Bromine Br2 | Iodine I2 | Astatine At2 | Phosphorus P2 | Sulphur S2 v d e Periodic table H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Uub Uut Uuq Uup Uuh Uus Uuo Alkali metals Alkaline earth metals Lanthanoids Actinoids Transition metals Other metals Metalloids Other nonmetals Halogens Noble gases Retrieved from http://en..org/wiki/Iodine Categories: Dietary minerals | Iodine | Halogens | DEA List I chemicalsHidden categories: All articles with statements | Articles with statements since April 2007 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Afrikaans العربية বাংলা БеларуÑ?каÑ? Bosanski БългарÑ?ки Català Чăвашла ÄŒesky Corsu Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara Ù?ارسی Français Furlan Gaeilge Gaelg Galego í•œêµì–´ Õ€Õ¡ÕµÕ¥Ö€Õ¥Õ¶ Hrvatski Ido Bahasa Indonesia Ã?slenska Italiano עברית Basa Jawa Kiswahili Kreyòl ayisyen Latina LatvieÅ¡u Lëtzebuergesch Lietuvių Lojban Magyar МакедонÑ?ки മലയാളം मराठी Nederlands 日本語 ‪Norsk bokmÃ¥l‬ ‪Norsk nynorsk‬ Occitan O'zbek Plattdüütsch Polski Português Română Runa Simi РуÑ?Ñ?кий Shqip Sicilianu Simple English SlovenÄ?ina SlovenÅ¡Ä?ina СрпÑ?ки / Srpski Srpskohrvatski / СрпÑ?кохрватÑ?ки Suomi Svenska Tagalog தமிழà¯? తెలà±?à°—à±? ไทย Tiếng Việt Тоҷикӣ Türkçe УкраїнÑ?ька 粵語 ä¸æ–‡ This page was last modified on 12 August 2008, at 19:47
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