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. Critical for compliance with regulatory standards, as elevated nitrite concentrations can indicate pollution from agricultural runoff, sewage, or industrial discharges. Supports quality control procedures in water treatment plants and environmental research studies focused on nutrient pollution and aquatic ecosystem health.