Used as a stable isotope-labeled compound in analytical chemistry, particularly in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS). It serves as an internal standard for the quantification of acetaldehyde in various samples, ensuring accurate and precise measurements. Applied in metabolic studies to trace biochemical pathways and understand the behavior of acetaldehyde in biological systems. Also utilized in environmental research to monitor acetaldehyde levels in air, water, and other matrices, aiding in pollution control and safety assessments. Its deuterium labeling minimizes interference in analytical techniques, enhancing reliability in scientific investigations.