Which of the following is NOT a requirement for iodine usage?

• A. Minimum temp 68°F
• B. Minimum temp 75°F
• C. pH 5.0 or less
• D. Concentration 12.5-25 mg/L

Answer: (B)

Iodine sanitizers work best when they’re used under specific conditions that keep the iodine active: a minimum temperature, a controlled acidity, and a defined concentration. The operating minimum temperature is 68°F, so you must be above that to ensure the sanitizer remains effective. The pH needs to be kept at 5.0 or less because iodine is more effective in more acidic conditions and higher pH can reduce its activity. The concentration should be in the range of 12.5 to 25 mg/L to provide an adequate residual amount of iodine for sanitizing action. A minimum temperature of 75°F is not a required criterion; 68°F is the stated minimum, and 75°F is simply a higher temperature, not a defined minimum.