Used as a reference standard in environmental testing laboratories to calibrate analytical instruments for the detection and quantification of polychlorinated biphenyls (PCBs) in soil, water, and biological samples. Helps ensure accurate measurement of PCB contamination in compliance with regulatory monitoring programs. Commonly employed in gas chromatography (GC) and mass spectrometry (MS) analyses due to its well-defined composition and stability. Supports research on persistent organic pollutants and aids in assessing human and ecological exposure risks.