Used as a reference standard in analytical laboratories for the detection and quantification of phenanthrene in environmental samples such as water, soil, and air. Commonly employed in gas chromatography (GC) and high-performance liquid chromatography (HPLC) to calibrate instruments and validate methods. Essential in monitoring polycyclic aromatic hydrocarbon (PAH) contamination, especially in industrial emissions, wastewater, and polluted sites. Supports quality control in environmental testing and regulatory compliance studies.