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Background Some harmful chemical substances produced by industrial activities remain in the environment for a very long time once released. There, they can accumulate via the food chain 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 th ...

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 ...