Used as a sensitive reagent in analytical chemistry for the determination of metal ions, particularly zinc, cadmium, and lead, through complexometric titrations and spectrophotometric methods. It forms colored complexes with these metals, enabling accurate detection and quantification in various samples, including environmental, biological, and industrial materials. Additionally, it serves as a pH indicator in certain chemical reactions due to its distinct color change properties. Its stability and selectivity make it valuable in research and quality control applications for metal analysis.