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Essay about Analysis on a toxin in the environment, PCB

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Analysis on a toxin in the environment, PCB
As one of POPs, PCB pollution has a unimaginable impact on the environment. PCB mainly comes from the extensive use of PCB factories worldwide, such as the motor factory uses PCB as insulating oil, and chemical plant extensive uses PCB as heat carrier and lubricating oil. The corrosion resistance of coating in ship contains PCB, so if it is dissolved by seawater, it is also a considerable pollution source. PCB from such sources enters the drainage system with the forms of waste oil, slurry, and paint peeling, deposits on the bottom, then slowly flows to the water, and pollutes ecology system. PCB in the atmosphere are mainly attached to the particles, and attached on the suspended particulate matter in the water. Under the condition of strong agitation or the presence of surfactant, PCB can be partially soluble in water. The oil polluting the sea can cause PCB disperse in water, and flow along with water. A lot of PCB dissolve in the oil film floating in the surface of sea and make the surface layer of plankton suffer serious damage. After PCB pollutes the atmosphere, water and soil, it enters the organisms through the food chain.
It is estimated that the total PCB reach 250 thousand to 300 thousand tons in ocean, soil, and atmosphere all over the world, with a wide range of pollution. From the seal in the North Pole, the yellow flesh in Galapagos, to the sea birds' eggs in Antarctic Pole, it can be detected with PCB, so the PCB pollution has become a global problem. After PCB is absorbed by people or other animals, it can widely distribute throughout tissues, among which the fat has the most of content. The test on mammals with acute toxicity of has showed that rabbit is 8 ~ 11 ...


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...lychlorinated biphenyls. The methods mentioned above can be taken full use to deal with the 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 relation to breast cancer. Archives of Environmental Health, 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 which support the development of toxic equivalency factors (TEFs). CRC Critical Reviews in Toxicology, 21(1), 51-88.


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