Which sanitizer is commonly used at 50-99 ppm with a 7-second contact time for food-contact surfaces?

• A. Quats
• B. Iodine
• C. Chlorine
• D. Alcohol

Answer: (C)

Sanitizers for food-contact surfaces are defined by a balance of concentration and contact time to achieve effective microbial kill. The 50–99 ppm range with a 7-second contact time is a common specification for chlorine-based sanitizers, which makes them well-suited for quickly sanitizing equipment and utensils that touch food. Chlorine is broad-spectrum, fast-acting, and cost-effective, so when you see this specific pairing, it points to chlorine as the intended sanitizer.

Other options use different parameters: quats typically require higher concentrations and longer contact times to achieve the same level of disinfection; iodine operates on a different range and can have drawbacks like staining or taste effects; alcohol evaporates quickly and isn’t ideal for all food-contact surfaces, especially complex equipment, because it may not provide a sustained sanitizing effect.