Used as a reference standard in environmental testing to calibrate analytical instruments for detecting polychlorinated biphenyls (PCBs) in soil, water, and air samples. Commonly applied in gas chromatography and mass spectrometry to ensure accurate identification and quantification of PCB contaminants. Helps laboratories maintain compliance with regulatory standards by providing a known concentration for comparison. Also used in research studies focused on pollutant degradation, toxicity assessment, and monitoring industrial emissions.