Used as a deuterated internal standard in analytical chemistry, particularly in gas chromatography-mass spectrometry (GC-MS) for the quantification of bis(2-ethylhexyl) phthalate (DEHP) in various samples. Its deuterated structure ensures minimal interference with the analyte, providing accurate and reliable measurements. Commonly applied in environmental testing to detect DEHP in water, soil, and air samples, as well as in biomedical research for analyzing DEHP levels in biological tissues and fluids. Also utilized in quality control processes within the plastics industry to monitor DEHP content in polymer products.