Chromazurol S solution is widely used as a sensitive analytical reagent for the detection and quantification of metal ions, particularly aluminum, in various samples. It forms colored complexes with metal ions, making it valuable in spectrophotometric analysis. The solution is commonly applied in environmental testing to measure aluminum levels in water, helping assess pollution and water quality. It is also used in clinical laboratories for the determination of aluminum in biological samples such as serum or urine, which is important for monitoring patients with kidney disease or those exposed to high levels of aluminum. In research settings, Chromazurol S serves as an indicator in complexometric titrations and in the development of sensor systems for metal ion detection. Its high selectivity and color contrast upon metal binding make it effective in both qualitative and quantitative analysis.