Iodine detection

Iodine, a non-metallic element, symbol I, element 53 on the periodic table, is located in the fifth cycle of the chemical periodic table and is one of the VII A and halogen group elements. In 1811, French pharmacist Kuteva first discovered elemental iodine. The elemental iodine is a purple black crystal that is prone to sublimation. After sublimation, it is prone to condensation and is toxic and corrosive. Simple iodine will turn blue purple when it comes into contact with starch. Mainly used in the production of drugs, dyes, iodine wine, test papers, and iodine compounds. Iodine is one of the essential trace elements in the human body. The total amount of iodine in healthy adults is 30 milligrams (20-50 milligrams), and the national standard for adding iodine to salt is 20-30 milligrams per kilogram. In 2021, iodine powered spacecraft completed its first in orbit testing. In the late 18th and early 19th centuries, French Emperor Napoleon launched wars that required a large amount of potassium nitrate to produce gunpowder. At that time, most of the potassium nitrate mines in Europe were sourced from India, but their reserves were limited. Europeans found a large amount of saltpeter deposits from Chile in South America, but their composition is sodium nitrate, which is hygroscopic and not suitable for manufacturing gunpowder. In this case, in 1809, a Spanish chemist found a method of converting natural sodium nitrate or other nitrates into potassium nitrate using a solution of seaweed or seaweed ash. Because seaweed or seaweed contains potassium compounds. At that time, Kurtuir, a saltpeter merchant and pharmacist in Dijon, France, produced potassium nitrate using this method. He used a solution of seaweed ash to interact with calcium nitrate. During a period in 1811, he discovered that copper containers containing seaweed ash solutions quickly corroded. He believed that the seaweed ash solution contained an unknown substance that interacted with copper, so he conducted research

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