Iodine occurs to a minute extent (less than 0.001%)in sea water,but is found in greater concentration,combined in organic form in certain seaweeds.in oysters and in cod livers. Crude Chile saltpetre,or caliche contains small amounts of sodium iodate,from which iodine can be obtained (see below). Some insoluble iodides.for example mercury(II),occur in Mexico.Iodine is found in the human body in the compound thyroxin in the thyroid gland;deficiency of iodine in diet causes enlargement of this gland (goitre).
Iodine is rarely prepared in the laboratory;the method used is the oxidation of an iodine by manganese(IV)oxide and sulphuric acid,for example with sodium iodide.
Iodine occurs to a minute extent (less than 0.001%)in sea water,but is found in greater concentration,combined in organic form in certain seaweeds.in oysters and in cod livers. Crude Chile saltpetre,or caliche contains small amounts of sodium iodate,from which iodine can be obtained (see below). Some insoluble iodides.for example mercury(II),occur in Mexico.Iodine is found in the human body in the compound thyroxin in the thyroid gland;deficiency of iodine in diet causes enlargement of this gland (goitre). Iodine is rarely prepared in the laboratory;the method used is the oxidation of an iodine by manganese(IV)oxide and sulphuric acid,for example with sodium iodide.
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