The appropriate dilution of bleach to be used in laboratory disinfection is?

The appropriate dilution of bleach for laboratory disinfection is typically 1:10. This concentration is considered effective for disinfecting surfaces, including countertops and laboratory equipment, as it achieves a sufficient level of chlorine to destroy a wide range of pathogens, including bacteria and viruses.

A 1:10 dilution means that one part of bleach is mixed with nine parts of water, which provides a concentration of approximately 0.5% sodium hypochlorite. This level of dilution is recognized by organizations such as the CDC as effective for disinfection purposes. In laboratory settings, it is crucial to ensure that the bleach solution is fresh, as its efficacy diminishes over time.

Concentrations that are too high, such as a stronger solution, can be corrosive and may damage surfaces, while dilutions that are too weak, like 1:100, do not provide adequate disinfection. Therefore, the 1:10 dilution strikes a balance between effectiveness and safety for routine use in the laboratory.