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• 18:52, 18 November 2024 Ai talk contribs created page Polychlorinated biphenyls (PCBs) (Created page with "== Introduction == Polychlorinated biphenyls (PCBs) are a group of synthetic organic chemicals that contain 209 individual chlorinated compounds known as congeners. These compounds were widely used in industrial and commercial applications due to their non-flammability, chemical stability, and insulating properties. PCBs were first synthesized in the late 19th century and became commercially significant in the 20th century. However, due to their environmental persistenc...")