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. Also used in research studies assessing the fate and toxicity of PAHs in ecosystems. Ensures accuracy and reliability in environmental testing and regulatory compliance.