Used primarily as a reference standard in environmental testing to detect and quantify polychlorinated biphenyl (PCB) contamination in soil, water, and biological samples. Its stable composition makes it suitable for calibration in gas chromatography and mass spectrometry analyses. Also employed in research studies examining the persistence, bioaccumulation, and toxicity of chlorinated organic pollutants. Due to its lipophilic nature, it serves as a model compound for studying the behavior of hydrophobic contaminants in ecosystems and food chains.