The best strategy seems to be eating a variety of foods. Dairy and meat products used to contain more iodine because it was fed to livestock and used to disinfect the machinery, but this practise is less common these days.
Things from the sea, seafood and seaweeds, are good sources of iodine. During the cold war, some people kept iodine pills in case of a nuclear attack. The idea was that taking them would keep your thyroid from accumulating radioactive iodine, as though that would be your biggest problem.
If you eat anywhere near a sensible diet, your iodine intake should probably be okay. But I am not a medical doctor or dietician, so take this advice with a grain of iodized salt. Sunday, July 12, What is Iodized Salt? Try testing the iodized salt solution again but this time leave out the vinegar. Does the reaction still take place, turning the solution a blue-purple color?
If the reaction occurred, did it take a longer amount of time to happen? You could try this activity again, but test an iodized salt solution at different temperatures by heating or cooling the distilled water. How does changing the temperature of the solution change how the color-changing reaction takes place? Observations and results Did the iodized table salt solution change to a blue-purple color when you mixed in the starch?
Did the "lite" table salt similarly change color whereas most of the other salt types did not? In this activity you should have seen that the iodized table salt and the "lite" table salt solutions both changed to a blue-purple color as did the iodine antiseptic solution, if you used it. This indicates that iodide is present in these types of salts. You likely saw no color change for the solutions made using the noniodized salt, rock salt, kosher salt or sea salt because these varieties do not typically contain iodide.
The starch solution was used in this activity because it forms a blue-purple—colored chemical when combined with iodine. Hydrogen peroxide is used to turn the salt's iodide into iodine, which the starch reacts with.
Cleanup Be sure to thoroughly wash any measuring spoons or other utensils that came into contact with the solutions made in this science activity.
You can dispose of the solutions by pouring them down the drain. This activity brought to you in partnership with Science Buddies. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Discover World-Changing Science. Key concepts Nutrients Diet Food Health Chemical reactions Introduction Have you ever noticed if the salt you're using says it's "iodized"?
The Dietary Guidelines for Americans recommend limiting sodium to less than 2, milligrams a day. That's roughly how much sodium is in 1 teaspoon of table salt.
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