Aldicarb-d3 is a deuterated (isotope-labeled) internal standard used in analytical chemistry for the quantification of aldicarb residues in environmental and biological samples. Its isotopic labeling enables precise differentiation and accurate analysis in mass spectrometry (e.g., GC-MS, LC-MS) and chromatography methods. Helps ensure accuracy and precision in these analyses. Applied in research and regulatory testing to monitor pesticide levels in food, water, and soil. Supports studies on the degradation, metabolism, and migration of aldicarb in various environments.