Sodium iodate is extracted from the caliche and reduced to iodide by sodium bisulfite. For example, trivalent americium forms insoluble fluoride, oxalate, iodate, hydroxide, phosphate and other salts. Calcium iodates are inorganic compound composed of calcium and iodate anion. Like potassium bromate, potassium iodate is occasionally used as a maturing agent in baking. Calcium iodate is used as supplement of iodine. Minerals containing essential iodate anions are very rare. Potassium iodate is sometimes used for iodination of table salt to prevent iodine deficiency. This being entirely independent of the availability of iodate or iodide drugs. However, they have been detected as intermediates in the conversion between iodide and iodate. Sodium iodate (NaIO) is the sodium salt of iodic acid. In other countries, potassium iodate is used as a source for dietary iodine. Sodium iodate comprises 15 to 50 mg per kilogram of applicable salt. In the iodate minerals iodine is always pentavalent, i.e., present as the anions. The main use of sodium iodate in everyday life is in iodised salt. Examples are sodium iodate (NaIO), silver iodate (AgIO), and calcium iodate (Ca(IO)).