Used in environmental monitoring and water quality analysis to detect and quantify common anions such as fluoride, chloride, bromide, nitrate, sulfate, and phosphate in drinking water, wastewater, and natural water sources. These anionic mixtures are essential for ion chromatography calibration and system validation, ensuring accurate measurement of contaminants and nutrient levels. They also support industrial process control in sectors like semiconductor manufacturing, where trace anion levels must be monitored to maintain purity standards. In agricultural testing, the mixture helps assess soil and irrigation water for nutrient balance and salinity issues. Additionally, it is used in research and regulatory laboratories for compliance testing under environmental protection guidelines.