Used as a reference standard in analytical chemistry for the calibration of instruments such as gas chromatographs (GC) and mass spectrometers (MS). Ensures accurate quantification and identification of tributyl phosphate in environmental samples, industrial effluents, and nuclear fuel processing streams. Commonly applied in quality control and regulatory testing to monitor contamination levels and assess compliance with safety standards. Also employed in research settings to study solvent extraction behavior, particularly in nuclear waste treatment where tributyl phosphate acts as a key extractant.