Discuss the sources and health effects of mercury, dioxins and furans

Mercury sources 

The largest source of emissions to the atmosphere is currently coal fi red power stations, however, the widespread use of mercury in dental amalgam means that in the future, crematoria could become the most signifi cant source. Hospitals with medical waste incinerators are also a major contributor to the mercury problem, and although emissions are decreasing as the number of medical waste incinerators is reduced, there is concern within the health community that the use of mercury in healthcare products is exposing patients and other vulnerable groups. The chlor-alkali industry, the biggest single user of mercury in Europe, has released many tonnes of mercury to the aquatic environment over the years, and contributed to fi sh contamination52.

Although mercury and its compounds are toxic substances, there is ongoing debate about exactly how toxic they are. Toxic effects, especially in the case of methylmercury, may be taking place at lower concentrations than previously thought, but this is proving difficult to establish because the suspected toxic effects are subtle and their mechanisms complex. Methylmercury is of particular concern because it can accumulate in the food chain to reach high concentrations (biomagnification). More...

Methylmercury is special among organic mercury compounds because large numbers of people are exposed to it and its toxicity is better understood. Methylmercury in food, such as fish, is ___ ______ _____ _______ ________ _________ _________ ________ ___ ________.
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