Used as a reference standard in environmental testing laboratories to calibrate instruments and validate analytical methods for the detection and quantification of chlorite in water samples. Ensures accuracy and reliability in monitoring chlorite levels, which is critical for compliance with drinking water quality regulations. Commonly used in municipal water treatment facilities, regulatory agencies, and research institutions to maintain consistent water safety standards. Helps assess the effectiveness of disinfection processes, particularly those involving chlorine dioxide, by providing a known concentration for comparison in test procedures.