Used as a standard reference material in environmental testing and research, particularly for the analysis of polychlorinated biphenyls (PCBs) in various samples. It helps in calibrating and validating analytical instruments like gas chromatographs and mass spectrometers to ensure accurate detection and quantification of PCBs in environmental matrices such as soil, water, and air. This chemical is essential for monitoring PCB contamination, assessing environmental risks, and ensuring compliance with regulatory standards.