Used as a stable isotope-labeled reagent in mass spectrometry and NMR spectroscopy for tracing nitrogen and hydrogen pathways in chemical and biochemical reactions. Commonly applied in metabolic studies to monitor ammonium ion uptake in biological systems without introducing chemical interference. Also utilized in deuterium labeling experiments to study reaction mechanisms and kinetics in organic and inorganic synthesis. Suitable for preparing deuterated materials in semiconductor and optical coating industries where isotopic purity is critical.