Used as a stable isotope-labeled internal standard in mass spectrometry for the quantitative analysis of 2-chloro-1,3-propanediol (3-MCPD) in food and biological samples. Its deuterated structure allows for accurate detection and differentiation from the non-labeled compound, improving precision in analytical methods. Commonly applied in monitoring food safety, especially in processed oils and fats where 3-MCPD esters may form during refining. Also utilized in metabolic studies to track the behavior and elimination of chloropropanols in biological systems.