Which of these methods can be used to ensure safe disposal of potentially hazardous materials?

Using a bleach solution is an appropriate method for ensuring safe disposal of potentially hazardous materials, but it typically only applies to specific types of waste, such as certain biological materials or surfaces that need to be sanitized. Bleach is a strong disinfectant that can effectively neutralize bacteria, viruses, and some organic materials when used correctly, making it a suitable choice for decontamination purposes in some contexts.

However, it's important to note that this method must be employed with caution, as bleach can produce harmful fumes and should not be mixed with other chemicals, particularly ammonia, as that can create toxic gases. The effectiveness of using a bleach solution also depends on the concentration used and the nature of the hazardous material being disposed of.

The other methods mentioned would not be suitable or safe for disposing of potentially hazardous materials. For instance, storing hazardous materials in regular trash can lead to contamination and pose health risks. Open burning can release toxic substances into the atmosphere and violate environmental regulations. Finally, disposing of hazardous materials by throwing them down the sink can lead to severe contamination of water supplies and environmental harm, making this an unsafe disposal method.