Acenaphthene-d10, a deuterated form of acenaphthene, is primarily used as an internal standard in analytical chemistry, particularly in gas chromatography-mass spectrometry (GC-MS). Its stable isotopic labeling ensures minimal interference with the analysis of non-deuterated compounds, making it ideal for quantifying acenaphthene and related polycyclic aromatic hydrocarbons (PAHs) in environmental samples. This chemical is also employed in research studies to track the behavior and degradation of PAHs in various matrices, such as soil, water, and air. Additionally, it serves as a reference compound in the development and validation of analytical methods, ensuring accuracy and precision in measurements.