Polychlorinated biphenyls are a series of compounds. According to the substitution position and quantity of chlorine atom, there are 2 10 compounds, which are collectively called PCBs. These compounds have excellent chemical stability and thermal stability, and can be used as insulating materials and coatings. PCBs are insoluble in water, but soluble in organic solvents. Once it enters the organism through the food chain, it is easy to accumulate in adipose tissue. Polychlorinated biphenyls (PCBs) are a kind of POPs (persistent organic pollutants), which are not easily decomposed in nature and can exist for a long time, causing chronic and lasting harm. The rice bran oil incident in Japan, one of the eight major public hazards, was caused by residents eating rice bran oil containing PCBs. The patient was red and swollen, nausea and vomiting, decreased cardiopulmonary function, and even died. Polychlorinated biphenyls (PCBs) are also one of the priority pollutants in China, and should have stopped using them by now. For PCBs that still exist, they are usually treated by landfill, incineration or chemical oxidation.
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