Used in environmental monitoring and water quality analysis to detect and quantify common anions such as fluoride, chloride, bromide, nitrate, sulfate, phosphate, and nitrite in drinking water, wastewater, and natural water sources. These mixtures serve as calibration standards in ion chromatography, ensuring accurate identification and measurement of ionic contaminants. They are essential in regulatory compliance testing, helping to monitor pollution levels, assess public health risks, and maintain safety standards in water treatment processes. Also used in agricultural and soil testing to evaluate nutrient levels and potential runoff impacts on ecosystems.