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The concentration of eight naturally occurring elements (Hg, Cd, Pb, Cu, Ni, Zn, Cr, As) and radioisotopes in sea water, sediments and marine organisms which are important from the point of view of pollution are reviewed. For the same elements data on their toxicity on marine organisms are listed emphasizing the lowest concentrations which are effective. The distribution of artificially introduced pollutants (‘pesticides’, oils and hydrocarbons and detergents) in the marine environment and their toxicity to marine organisms are discussed. Taking into consideration the amount of fishery products consumed by the general public and by critical populations (minorities) and the data available on maximum permissible weekly intake of pollutants by man the maximum amount of fish which can be consumed is calculated. The results show that mercury intake from fish is excessive for certain minorities, such as fishermen and their families.Comparing the ‘minimum risk’ concentration of pollutants to marine organisms with the natural concentrations show that again mercury is highly effective on marine organisms and that only slight increases in mercury, but also in zinc and nickel can affect marine organisms. However, due to the great difficulties encountered in extrapolating the results of toxicity experiments to natural conditions more research is needed to establish toxicity limits in nature.

pollutants اصلی در محیط MARINE

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