Used as a reference standard in environmental testing laboratories to calibrate instruments and validate analytical methods for the determination of nitrite nitrogen in water samples. Ensures accuracy and reliability in monitoring nitrite levels in drinking water, wastewater, and surface water. Supports compliance with regulatory standards by providing a known concentration for quality control and assurance programs. Commonly used in spectrophotometric, colorimetric, and ion chromatography analyses. Helps detect contamination from agricultural runoff, sewage, and industrial discharges, contributing to safe water management practices.