LYCOS RETRIEVER 
Iodine: Water
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Iodine possesses a characteristic penetrating smell, not so pungent... as that of chlorine or bromine. It is only very sparingly soluble in water, but dissolves readily in solutions of the alkaline iodides and in alcohol, ether, carbon bisulphide, chloroform, and many liquid hydrocarbons. Its solutions in the alkaline iodides and in alcohol and ether are brown in colour, whilst in chloroform and carbon bisulphide the solution is violet. It appears to combine with the solvent (P. Waentig, Zeit. phys.
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Food sources: Iodine content of food and water depends primarily on the supply of iodine in the soil. Glaciated, mountainous or heavy rainfall areas are likely to be low in iodine placing human and animal populations at risk. Thus, individuals can not usually improve iodine intake by diversifying their diet. Some plants, including cabbage, Brussels sprouts, legumes, and cassava contain goitrogenous substances that interfere with iodine absorption. This is of public health concern only where these foods are regularly consumed in large amounts and dietary iodine is low.
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Iodine is an antiseptic and can be used to kill bacteria and fungi. Iodine used topically as a douche is effective against a wide range of organisms including candida and chlamydia. Excessive use should be avoided since some iodine will be absorbed into the system and can cause suppression of thyroid function. Iodine tablets are frequently used to disinfect water.
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Iodine in surface water will vaporize and re-enter the air as a result. Humans ... add iodine gas to the air, by burning coal or fuel oil for energy. But the amount of iodine that enters the air through human activity is fairly small compared to the amount that vaporizes from the oceans.
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Iodine may be recovered only from such concentrated natural sources as slat lakes water, associated oil waters, or seaweed. One ton of laminaria contains up to 5 kg of iodine; meanwhile its concentration in seawater is 20 - 30g in 1 ton.
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Iodine is added to nearly any kind of salt that is applied. It is an ingredient of bread, sea fish and oceanic plants. Iodine is naturally present in the ocean and some sea fish and water plants will store it in their tissues.
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