All of the following are factors influencing chemical disinfection EXCEPT:

In the context of chemical disinfection, several key factors influence the effectiveness of the disinfection process. Exposure time is crucial because the longer a disinfectant has contact with the surface, the more effective it will be in killing microorganisms. The amount of bioburden present is also significant; heavy contamination can shield microbes from the action of the disinfectant and reduce its efficacy. Similarly, the pH level can affect the potency of certain chemical agents, as some disinfectants work better in specific pH ranges.

Pounds of steam pressure, on the other hand, primarily pertains to sterilization processes that utilize steam, such as autoclaving, rather than chemical disinfection. In chemical disinfection, steam pressure is not a relevant factor, as it does not influence how well disinfectants perform. Thus, the correct option highlights a factor that does not pertain to chemical disinfection protocols.