Used primarily as a model compound in environmental toxicity studies, especially to assess the behavior and effects of polychlorinated biphenyls (PCBs) in ecosystems. Due to its structural similarity to persistent organic pollutants, it helps researchers understand bioaccumulation, degradation pathways, and toxicological impacts on aquatic and terrestrial organisms. It is also employed in analytical chemistry as a reference standard for detecting PCB contamination in soil, water, and biological samples. Its stability and chlorine substitution pattern make it useful for studying enzyme interactions, particularly with cytochrome P450 systems involved in xenobiotic metabolism.