What field test is recommended for measuring chlorine in water?

The DPD (N,N-diethyl-p-phenylenediamine) method is a widely used field test for measuring chlorine levels in water. This method is based on a colorimetric analysis where the DPD reagent reacts with free chlorine in the water, producing a distinct pink color that correlates to the concentration of chlorine present. The intensity of the color can then be measured using a colorimeter or spectrophotometer to provide accurate results.

The recommendation of the SNORT method alongside DPD further enhances the testing process by allowing for quick field assessments. SNORT (Simple Nitrogen, Odor, and Residual Testing) is particularly useful because it streamlines the testing procedure for field technicians, enabling them to quickly assess water quality without extensive laboratory setup.

In contrast, the other methods listed focus on different aspects of water quality or require more complicated procedures that are not primarily aimed at measuring chlorine. The HACH method and turbidity index primarily deal with turbidity, while colorimetric methods and pH analysis are broader and not specific to chlorine measurement. Electrochemical methods and titration might provide results for chlorine as well, but they typically involve more complex processes that are not as practical for routine field testing in environmental health.