Used as an analytical reagent for the detection and determination of certain metal ions, particularly in spectrophotometric analysis. It forms stable, colored complexes with metals such as copper, nickel, and cobalt, enhancing sensitivity and selectivity in trace metal detection. Its derivative structure allows for strong chelating properties, making it valuable in environmental monitoring, industrial quality control, and research laboratories where precise metal quantification is required. The monohydrate form contributes to improved solubility and handling in aqueous-based analytical methods.