PCBs General introduction Burning produces dioxins Dioxins and some PCBs cause multiple toxic effects. Dioxins and PCBs accumulate in the human body.
Risk assessment is tricky.
Common sources of errors and practical difficulties. Their stability is a technical advantage , but it also means that they are extremely persistent in the environment . They also contain small amounts of dioxin impurities especially PCDFs, some of which are much more toxic than the main chemicals. Because PCBs are considered problem waste, their disposal is expensive, and may sometimes lead to attempts to dispose of them by mixing them to other waste products. In both cases rice oil was contaminated and caused a number of health effects.