Final answer:
Iodine and quats must remain in contact for a certain amount of time to be effective in killing microorganisms.
Step-by-step explanation:
Iodine and quats must remain in contact for a certain amount of time to be effective. This is because both iodine and quats are types of disinfectants that work by targeting and killing microorganisms. For example, iodine is commonly used as an iodophor compound in which iodine is complexed to an organic molecule, increasing its stability and efficacy as a disinfectant. In order for the iodine to exert its disinfecting effect, it needs to stay in contact with the target microorganisms for a sufficient duration, allowing enough time for the iodine to act and kill the microbes.