Used as a reference standard in analytical laboratories for the calibration of instruments such as gas chromatographs (GC) and high-performance liquid chromatographs (HPLC). Ensures accurate quantification and detection of organophosphorus compounds in environmental samples, industrial effluents, and chemical process streams. Also employed in quality control procedures for solvent purity testing and in research studies involving plasticizers and flame retardants. Its consistent concentration allows for reliable method validation and compliance with regulatory testing protocols.