What are the main source of …
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Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Main sources of iodine:–
Due to its reactivity iodine is not found in nature in free state
Its main sources are -
(i) Sea weeds
(ii) Chile salt peter
(iii) Natural brine
Extraction of Iodine from sea weeds – Sea weed, lamineria contains iodine. Sea weed is well dried and burnt in deep pits carefully so that iodine do not get destroyed. The obtained ash is called kalp, which contains 0.4 to 1.3% iodine. Kelp is dissolved in water and solution is partially crystalised when less soluble KI and NaI remain in the mother liquor. Conc H2SO4 is added when basic sulphides deposit at the bottom, which is filtered and removed. Now the filtrate is mixed with MnO2 and conc. H2SO4 and heated in an iron vessel. Iodine vapourises due to the reaction and is collected in “Aludel”, Iodine is now collected as solid after condensation.
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