Used in environmental monitoring and water quality testing to detect and quantify halides and anions such as fluoride, chloride, bromide, nitrate, and sulfate in drinking water, wastewater, and industrial effluents. These anionic mixtures are essential for ion chromatography calibration and analysis, helping ensure compliance with regulatory standards for public health and environmental protection. They also support research in atmospheric chemistry, where nitrate and sulfate levels indicate pollution sources such as acid rain or industrial emissions. In industrial processes, monitoring these anions helps control corrosion, optimize chemical reactions, and maintain product purity in sectors like semiconductor manufacturing and pharmaceuticals.