Initial dilution concentration for iodine-type disinfectant?

• A. 10 ppm
• B. 50 ppm
• C. 25 ppm
• D. 75 ppm

Answer: (C)

Iodine-based sanitizers for food-contact surfaces are used at a relatively low residual level of available iodine to be effective yet safe. The typical target for the initial dilution is about 25 parts per million (ppm). This concentration provides reliable sanitizing action with the standard contact time while minimizing odor, staining, and potential corrosion. To reach 25 ppm, follow the product’s label instructions, as many iodophor sanitizers are designed to be diluted to that level for routine use. Use test strips to verify the concentration and refresh the solution as recommended, since organic matter and time can affect effectiveness. Concentrations much lower than this can be ineffective, while much higher concentrations are usually unnecessary and can cause unwanted side effects.