Almost 25 years after they were first banned, polychlorinated biphenyls (PCBs) almost certainly continue to be widespread in the Danish environment, according to a new study by the National environmental research institute (DMU) of "the occurrence, sources, transport and fate of persistent environmental pollutants in a local environment".
Samples of sewage sludge, soil and sediment in Roskilde, eastern Denmark that had previously been investigated for nonyl- and alkylphenol ethoxylates (NPEs and APEs) were analysed for a total of 43 substances, including PCBs. The study found that "PCBs were the most abundant organohalogen in the environment", even though they had been banned since 1977.
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