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Background Harmful industrial chemicals can remain in the environment for very long periods of time, enabling them to accumulate via food chains and, if toxic, exert harmful effects on living organisms. These so-called persistent bio-accumulative toxic (PBT) substances can also be transported long distances from their original emission source, causing sig ...

Background Chemicals released into the environment can remain in the environment for very long time due to their persistence. If they are also bio-accumulative, they accumulate in the food chain. If toxic, they can harm living organisms. Emissions into the acquatic environment of certain target substances is subject to regulation, and limiting or stopping ...