Iodine Resublimed

Iodine Resublimed, 20-mesh or less, for saturated reference electrode. 

Iodine, elemental Iodine, resublimed Iron sulfate Isotopes, radioactive Laboratory chemicals, inorganic... 

Actomar AI3-08544 Caswell No, 501 Diiodine EINECS 231-442-4 EPA Pesticide Chemical Code 046905 Eranol Ethanolio solution of iodine HSDB 34 lODE Iodine iodine (resublimed) Iodine-127 Iodine colloidal Iodine crystals Iodine solution Iodine sublimed Iodine Tincture DSP lodio losan superdip Jod Jood Molecular Iodine NSC 42355 Tincture iodine Vistarin. Nonmetallic halogen element dyes, alkylation and condensation catalyst, iodides, iodates, antiseptics, germicides, x-ray contrast media, food and feed additive, stabilizers, photographic film, water treatment,... 

Into a 1-litre beaker, provided with a mechanical stirrer, place 36 - 8 g. (36 ml.) of aniline, 50 g. of sodium bicarbonate and 350 ml. of water cool to 12-15° by the addition of a little crushed ice. Stir the mixture, and introduce 85 g. of powdered, resublimed iodine in portions of 5-6 g, at intervals of 2-3 minutes so that all the iodine is added during 30 minutes. Continue stirring for 20-30 minutes, by which time the colour of the free iodine in the solution has practically disappeared and the reaction is complete. Filter the crude p-iodoaniline with suction on a Buchner funnel, drain as completely as possible, and dry it in the air. Save the filtrate for the recovery of the iodine (1). Place the crude product in a 750 ml. round-bottomed flask fitted with a reflux double surface condenser add 325 ml. of light petroleum, b.p. 60-80°, and heat in a water bath maintained at 75-80°. Shake the flask frequently and after about 15 minutes, slowly decant the clear hot solution into a beaker set in a freezing mixture of ice and salt, and stir constantly. The p-iodoaniline crystallises almost immediately in almost colourless needles filter and dry the crystals in the air. Return the filtrate to the flask for use in a second extraction as before (2). The yield of p-iodoaniline, m.p. 62-63°, is 60 g. 

Iodine, Q.IN (0 to 1 —). Dissolve 12.690 g of resublimed iodine in 25 mL of a solution containing 15 g of KI which is free from iodate. After all the solid has dissolved, dilute to 1 L. If desired, check against a standard arsenite or standard thiosulfate solution. 

Wijs solution (for iodine number) dissolve 13 g resublimed iodine in 1 liter of glacial acetic acid (99.5%), and pass in washed and dried (over or through H2SO4) chlorine gas until the original thio titration of the solution is not quite doubled. There should be only a slight excess of iodine and no excess of chlorine. Preserve the solution in amber colored bottles sealed with paraffin. Do not use the solution after it has been prepared for more than 30 days. 

The lustrous, purple-black metallic sheen of resublimed crystalline iodine was first observed... 

The commercial recovery of iodine on an industrial scale depends on the particular source of the element.Erom natural brines, such as those at Midland (Michigan) or in Russia or Japan, chlorine oxidation followed by air blowout as for bromine (above) is much used, the final purification being by resublimation. Alternatively the brine, after clarification, can be treated with just sufficient AgNOs to precipitate the Agl which is then treated with clean scrap iron or steel to form metallic Ag and a solution of EeU the Ag is redissolved in HNO3 for recycling and the solution is treated with CI2 to liberate the h ... 

World production of I2 in 1992 approached 15 000 tonnes, the dominant producers being Japan 41%, Chile 40%, USA 10% and the former Soviet Union 9%. Crude iodine is packed in double polythene-lined fibre drums of 10-50-kg capacity. Resublimed iodine is transported in lined fibre drums (11.3 kg) or in bottles containing 0.11, 0.45 or 2.26 kg. The price of I2 has traditionally fluctuated wildly. Thus, because of acute over-supply in 1990 the price for I2 peaked at 22/kg in 1988, falling to 12/kg in 1990 and 9.50/kg in 1992. Unlike CI2 and Br2, iodine has no predominant commercial outlet. About 50% is incorporated into a wide variety of organic compounds and about 15% each is accounted for as resublimed iodine, KI, and other inorganics. The end uses include catalysts for synthetic rubber manufacture, animal- and fowl-feed supplements. 

For the preparation of standard iodine solutions, resublimed iodine and iodate-free potassium iodide should be employed. The solution may be standardised against pure arsenic(III) oxide or with a sodium thiosulphate solution which has been recently standardised against potassium iodate. 

Procedure Preparation of 0.05A/ iodine. Dissolve 20 g of iodate-free potassium iodide in 30-40 mL. of water in a glass-stoppered 1 L graduated flask. Weigh out about 12.7 g of resublimed iodine on a watchglass on a rough balance (never on an analytical balance on account of the iodine vapour), and transfer it by means of a small dry funnel into the concentrated potassium iodide solution. Insert the glass stopper into the flask, and shake in the cold until all the iodine has dissolved. Allow the solution to acquire room temperature, and make up to the mark with distilled water. 

The tissues were fixed in 0.05 M cacodylate buffer containing 2.5% glutaraldehyde and 1.5% formaldehyde (pH 7.0) for 16 h. The ZIO mixture was prepared as follows 3 g zinc (powder) and 1 g resublimed iodine crystals were dissolved in 20 mL distilled water. After stirring for 5 min, the zinc was filtered off. The filtered solution was mixed with an equal volume of 2% 0s04 solution and the solution used immediately. Treatment with the ZIO mixture was carried out for 4 h at room temperature. 

Immerse the alginate beads according to a modified method of Akert and Sandri (44) for 3,16, or 20 h at 4°C in the ZIO mixture, which consisted of 3.75% zinc (powder) and 1.25% resublimed iodine crystals in 50 mM 2-(N-morpholino) ethanesulphonic acid-NaOH buffer (pH 5.8) containing 0.2 M glucose and 1% Os04 (MG buffer). 

Bismuth(III) iodide has been prepared in the absence of solvents by the reaction of iodine with elemental bismuth1,2 or with bismuth (III) sulfide.3 Alternative methods involve precipitation of bismuth(III) iodide from aqueous solutions of bismuth salts by adding alkali-metal iodides,4 and the addition of bismuth (III) oxide to a solution of iodine and tin(II) chloride in saturated hydrogen chloride.5 In either case the initial product is purified by sublimation, usually in an atmosphere of carbon dioxide. The product obtained by precipitation requires several resublimations for complete purification.6... 

The open end of the reaction tube is attached to an oil pump through a dust trap, and dry nitrogen is admitted at a rate such that the pressure is maintained at or below 25 mm. The bismuth(III) iodide is sublimed into the receiver end of the tube by heating with the spread burner flame and with an auxiliary Tirrill burner adjusted to maximum heat. Satisfactory progress of the sublimation is indicated by the persistence of yellowish-brown bis-muth(III) iodide vapors and by the absence of the violet color of iodine vapor. When the sublimation is complete, the tube is allowed to cool to room temperature in nitrogen at atmospheric pressure. The product is scraped from the receiver section of the tube and stored out of contact with the atmosphere. The yield is 72% based on bismuth. Anal. Calcd. for Bil3 Bi, 35.44. Found Bi, 35.42. The same result is found upon analysis of a resublimed sample of this product. 

Zirconium sponge (1.82 g., 0.020 mole) and resublimed sulfur (1.34 g., a slight excess over 0.040 mole) are charged into the transport tube. The procedures for adding iodine (5 mg./ml. of ampule volume) and heating that are described in the TiS2... 

Wijs Solution Dissolve 13 g of resublimed iodine in 1000 mL of glacial acetic acid. Pipet 10.0 mL of this solution into a 250-mL flask, add 20 mL of potassium iodide TS and 100 mL of water, and titrate with 0.1 N sodium thiosulfate, adding starch TS near the endpoint. Record the volume required as A. Set aside about 100 mL of the iodine-acetic acid solution for future use. Pass chlorine gas, washed and dried with sulfuric acid, through the remainder of the solution until a 10.0-mL portion requires not quite twice the volume of 0.1 N sodium thiosulfate consumed in the titration of the original iodine solution. A characteristic color change occurs when the desired amount of chlorine has been added. Alternatively, Wijs Solution may be prepared by dissolving 16.5 g of iodine monochloride, IC1, in 1000 mL of glacial acetic acid. Store the solution in amber bottles sealed with paraffin until ready for use, and use within 30 days. 

The photochemical lamp used in this study was developed by Har-teck. Reeves, and Thompson (5). This lamp is shown in Figure 3. The lamp consisted of concentric cylinders, the inner made of commercial quartz (Amersil Corporation) and the outer of 96% silica glass. Both condensed (d.c.) and glow (a.c.) discharges of about 8,000 volts could be applied to the electrodes. To provide the iodine vapor, a side-arm was attached which contained resublimed iodine. To provide a stable discharge and to prevent a chemical attack of the aluminum electrodes by the iodine vapor, argon was flowed through the inner tube continuously at about 1 mm. pressure. 

Mercury manometers should be isolated during this procedure. Iodine (1.3100 g, 5.16 mmole) is resublimed into a 10-mL ampule which is attached to the vacuum system and thoroughly evacuated. (Occasional cooling with a bath at -78° and the use of the glass wool above the ampule will minimize iodine contamination.) The ampule is cooled to -196° and dimethylgermane (about 6.0 mmole) is condensed into it. The reactants are isolated from the vacuum system... 

Iodine solution. Dissolve 10 g of potassium iodide in about 100 ml of distilled water. To this add 1.3 g well-powdered resublimed iodine and stir until completely dissolved then dilute to one liter. This solution is about 0.01 Af and is used to test for starch. 

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