Which of the following is not commonly used for disinfection of water?

Silver nitrate is not commonly used for disinfection of water primarily due to its limited effectiveness compared to other available disinfectants. While it does have some antimicrobial properties and can be used in specific applications, such as in certain medical scenarios or for treating wounds, it is not practical for broad-scale water disinfection.

On the other hand, chlorine is widely used because it effectively kills a broad range of pathogens and provides residual disinfection in water distribution systems. Chlorine-ammonia compounds, known as chloramines, are also commonly utilized, particularly where longer-lasting disinfection is required without the overpowering taste and odor sometimes associated with chlorine alone. Ozone is another strong oxidizer and disinfectant that is often favored for its ability to inactivate viruses and bacteria effectively, along with having no residual taste in the water.

In summary, while silver nitrate has niche applications, it lacks the broad utility and effectiveness of chlorine, chloramines, and ozone for large-scale water disinfection needs.