Used as a sensitive analytical reagent for the detection and spectrophotometric determination of trace metals, especially aluminum, beryllium, and zirconium in environmental, biological, and industrial samples. It forms highly colored complexes with these metals, allowing for precise measurement at low concentrations. Commonly applied in water quality testing, soil analysis, and pharmaceutical assays where accurate metal ion quantification is critical. Also utilized in research settings for developing colorimetric sensors and assays due to its strong chromogenic properties.