Used as a stable isotope-labeled internal standard in analytical chemistry for the accurate quantification of dichlorvos residues in environmental and biological samples. Its primary application is in mass spectrometry and gas chromatography methods, where it helps ensure precise measurement by compensating for losses during sample preparation and instrument variability. Commonly employed in pesticide residue monitoring, toxicology studies, and environmental fate studies due to its identical chemical behavior to non-labeled dichlorvos while being distinguishable by mass detection.