What is Lugols Iodine?

Lugols Iodine has been around for a long time, but what actually is this product? Our guide tells all.

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What is Lugols Iodine?

Lugol’s iodine, also known as Lugol’s solution, first made in 1829, is a solution of elemental iodine and potassium iodide in water, named after the French physician J.G.A. Lugol. Lugol’s iodine solution is often used as an antiseptic and disinfectant, for emergency disinfection of drinking water, and as a reagent for starch detection in routine laboratory and medical tests. These uses are possible since the solution is a source of effectively free elemental iodine, which is readily generated from the equilibration between elemental iodine molecules and triodide ion in the solution.

It has been used more rarely to replenish iodine deficiency. However, pure potassium iodide, containing the relatively benign iodide ion without the more toxic elemental iodine, is strongly preferred for this purpose. Likewise, in the Chernobyl disaster some Lugol’s solution was used as an emergency source of iodide to block radioactive iodine uptake, simply because it was widely available as a drinking water decontaminant, and pure potassium iodide without iodine (the preferred agent) was not available.

Science Use

• As a mordant when performing a Gram Stain
• Used as an indicator test for the presence of starches in organic compounds
• Used as a cell stain
• Used in experiments to observe how a cell membrane uses osmosis and diffusion
• Used in the marine aquarium industry

Important Note: Prior to using any of the products mentioned, it is highly recommended to thoroughly read and understand all safety precautions associated with each product.

Please be advised that this guide is intended for informational purposes only and APC Pure cannot accept any responsibility for the outcome of any usage based on this guide.