Used as a stable isotope-labeled internal standard in gas chromatography-mass spectrometry (GC-MS) for accurate quantification of alkanes in complex mixtures. Its deuterated structure allows clear differentiation from non-labeled compounds, minimizing interference from matrix components. Commonly applied in environmental analysis to track hydrocarbon contamination and degradation processes. Also utilized in metabolic studies and fuel research to monitor reaction pathways and assess combustion efficiency without introducing chemical noise.