Used primarily as a reference standard in environmental testing laboratories to detect and quantify polychlorinated biphenyl (PCB) contamination in soil, water, and biological samples. Its well-defined structure allows for accurate calibration of analytical instruments like gas chromatographs and mass spectrometers. Due to its persistence and toxicity profile, it also serves in research studying the fate, transport, and degradation of chlorinated organic pollutants in ecosystems. Often included in congener-specific PCB analysis to assess environmental and health risks associated with industrial pollution.