Used in environmental monitoring and water quality analysis to detect and quantify common anions in wastewater, drinking water, and industrial effluents. The mixture serves as a calibration standard in ion chromatography, ensuring accurate identification and measurement of anions like chloride, nitrate, nitrite, sulfate, and phosphate. It supports regulatory compliance by helping laboratories assess contamination levels, track pollution sources, and monitor treatment process efficiency. Also used in agricultural testing to evaluate soil and irrigation water for nutrient balance and salinity.