An Update on The Toxicity of PCBs
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چکیده
Although PCBs were banned in 1977, they remain a major public health and environmental concern because of their widespread presence. They have been found throughout the world, even in remote locations in the Arctic where no PCBs have ever been used. Estimates are that as much as 3.4 billion pounds of PCBs were manufactured worldwide and that 30 to 70% of the PCBs manufactured remain in use or in the environment (4). Once released into the environment, PCBs travel large distances by "hitchhiking" through the ecosystem, working their way up the food chain. They remain in the environment for long periods of time because they resist natural processes of decay.
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تاریخ انتشار 2001