Used primarily in research and environmental testing due to its persistence and toxicity. Serves as a reference standard in analytical chemistry for detecting polychlorinated biphenyls (PCBs) in soil, water, and biological samples. Helps in studying the breakdown and bioaccumulation of chlorinated compounds in ecosystems. Also utilized in laboratory studies assessing the impact of persistent organic pollutants on human health and wildlife, particularly for understanding endocrine disruption and long-term environmental contamination.