Used in calibration of analytical instruments for accurate detection and quantification of petroleum hydrocarbons in environmental and industrial samples. Commonly applied in gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) to identify contaminants such as benzene, toluene, ethylbenzene, and xylenes (BTEX) in soil, water, and air. Ensures compliance with regulatory standards in petroleum refining, fuel production, and environmental monitoring. Also used in quality control laboratories to validate test methods and maintain consistency in hydrocarbon analysis.