Used as a reference standard in analytical laboratories for the calibration of instruments such as gas chromatographs (GC) and mass spectrometers (MS). Commonly employed in environmental testing to detect and quantify volatile organic compounds (VOCs) in air, water, and soil samples. Also utilized in industrial hygiene for monitoring workplace exposure to aromatic hydrocarbons. Ensures accuracy and consistency in qualitative and quantitative analysis, especially in regulatory compliance and quality control settings.