Used as a sensitive reagent in the detection and determination of rare earth elements, particularly thorium and uranium, in analytical chemistry. It forms colored complexes with these metals, allowing for their quantification through spectrophotometric methods. Applied in environmental monitoring to assess contamination levels of heavy metals in water and soil samples. Also utilized in research laboratories for studying metal ion interactions and coordination chemistry. Its ability to selectively bind with specific metal ions makes it valuable in metallurgical analysis and quality control processes in industries dealing with rare earth elements.