![]() Iodine is required for the synthesis of thyroid hormones thyroxine (T 4) and triiodothyronine (T 3). People in a radioactive area are in danger of inhaling or ingesting iodine, which is highly toxic in large doses. Iodine is a component of nuclear fallout, the residual radioactive material that falls from the sky after a nuclear blast.It is not rare to see goiters in dogs, cattle, goats, birds and fish. Even animals can develop goiters due to iodine deficiency.In 1839, Louis Daguerre invented a method for producing images, called daguerreotypes, on thin sheets of metal. Photography was the first commercial use for iodine.Iodine is a good test for starch as it turns a deep blue color when it comes in contact with it.Once the connection between iodine deficiency and goiter was established, public health officials began looking for ways to alleviate the problem - eventually leading to iodized salt. People living further inland, however, were often iodine-deficient, resulting in a higher incidence of goiter. Before this, most people living along the coasts still got plenty of iodine just by being near the ocean and the coastal soil. The first iodized table salt was sold in Michigan in 1924. ![]() In 1831 he received the Montyon Prize from the Royal Academy of Sciences for his work, but unfortunately, he never gained any financial benefit from his discovery. ![]() It was given the name iode (from the Greek ioeidēs, meaning "violet colored") by French chemist Joseph Louis Gay-Lussac.Īlthough Courtois wasn't the one to name it, he was still later acknowledged as the first person to isolate iodine. He gave some samples to other scientists to continue the research who eventually confirmed that it was indeed a new element. He then discovered that the vapor would condense into deep violet crystals on cold surfaces.Īt the time, Courtois did not realize he had discovered iodine, but he suspected it might be a new element. After adding a little too much sulfuric acid one time, Courtois noticed a cloud of violet gas. Then, sulfuric acid was added to eliminate the leftover waste. In order to isolate the sodium and potassium extracts from the seaweed, Courtois would burn the seaweed and wash the ash with water. However, due to a wood ash shortage, he began using seaweed instead. Initially, he had been using wood ash as the source of potassium nitrate needed to make the saltpeter. Courtois was helping his father manufacture saltpeter - an important component in gunpowder that was in heavy demand at the time.
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