Why use phenol in phenol coefficient test?

Phenol is used in the phenol coefficient test because it serves as a standard reference for evaluating the antibacterial effectiveness of disinfectants. The test measures the dilution of a disinfectant that can kill a specific strain of bacteria within a specific time compared to the dilution of phenol that achieves the same effect. By comparing the disinfectant's efficacy to that of phenol, the phenol coefficient is determined, providing a quantitative measure of the disinfectant's potency. This standardized approach allows for consistent evaluation across different disinfectants.