Which method is used to measure chlorine residual in water treatment?

Amperometric titration is a well-established method for measuring chlorine residual in water treatment. This technique involves the use of an electrode that measures the current generated during the electrochemical reaction between chlorine and a titrant. As chlorine is titrated, the current changes, allowing for a precise measurement of the residual chlorine concentration in the water.

This method is particularly effective for chlorine measurement because it can provide real-time data and is capable of detecting very low concentrations of chlorine. This is essential in water treatment processes where maintaining appropriate chlorine levels is critical for disinfection while preventing any potential negative impacts on water quality or taste.

Understanding the significance of residual chlorine is crucial for operators managing water treatment facilities, as it ensures that sufficient disinfection is achieved to protect public health, while also balancing the need for safety in terms of chlorine levels. Amperometric titration's accuracy, specificity, and ability to work effectively across a range of conditions make it a preferred choice in professional water treatment settings.