Analysis of a toxin in the environment, PCBAs one of the POPs, PCB pollution has an unimaginable impact on the environment. PCB mainly comes from the extensive use of PCB factories around the world, for example, motor factory uses PCB as insulating oil, and chemical plant widely uses PCB as heat carrier and lubricating oil. The corrosion resistance of ships' coating contains PCBs, so if it is dissolved in sea water, it is also a significant source of pollution. PCBs from such sources enter the drainage system in the form of waste oils, sewage and peeling paint, settle at the bottom, then slowly flow into the water and pollute the ecological system. PCBs in the atmosphere are mainly attached to particles and attached to particulates suspended in water. Under conditions of strong agitation or in the presence of surfactant, PCB may be partially soluble in water. Oil polluting the sea can cause PCBs to disperse into the water and flow with the water. Many PCBs dissolve in the oil film floating on the sea surface and cause serious damage to the surface layer of plankton. After PCBs pollute the atmosphere, water and soil, they enter organisms through the food chain. The total amount of PCBs is estimated to reach 250 thousand to 300 thousand tons in the world's oceans, soil and atmosphere, with a wide range of pollution. From the North Pole seal, to the yellow meat of the Galapagos, to the seabird eggs of the Antarctic Pole, everything can be detected with PCB, so PCB pollution has become a global problem. After PCB is absorbed by people or other animals, it can be widely distributed in tissues, among which fat has the largest content. Mammalian acute toxicity testing showed that rabbit contains 8 ~ 11......middle of paper......glycchlorinated biphenyls. The above-mentioned methods can be fully used to deal with PCB pollution. Works Cited Falck Jr, F., Ricci Jr, A., Wolff, M. S., Godbold, J., & Deckers, P. (1991). Pesticides and polychlorinated biphenyl residues in human breast lipids and their relationship to breast cancer. Environmental Health Archives, 47(2), 143-146. Fein, G. G., Jacobson, J. L., Jacobson, S. W., Schwartz, P. M., & Dowler, J. K. (1984). Prenatal exposure to polychlorinated biphenyls: effects on birth size and gestational age. The Journal of pediatrics, 105(2), 315-320.Safe, S. (1990). Polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and related compounds: environmental and mechanistic considerations that support the development of toxic equivalence factors (TEFs). Critical reviews of CRC in toxicology, 21(1), 51-88.