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Basics of Bioaccumulation

Publié dans : Environnement
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  1. 1. Definitions “The biological sequestering of a substance at a higher concentration than that at which it occurs in the surrounding environment or medium” - US Geological Survey, 2007- “General term describing a process by which chemicals are taken up by an organism either directly from exposure to a contaminated medium or by consumption of food containing the chemical” -US Environmental Protection Agency, 2010-
  2. 2. “Progressive increase in the amount of a substance in an organism or part of an organism which occurs because the rate of intake exceeds the organism’s ability to remove the substance from the body” - International Union of Pure and Applied Chemistry, 1993- “Bioaccumulation means an increase in the concentration of a chemical in a biological organism over a time, compared to the chemical’s concentration in the environment. Compounds accumulate in living things anytime they are taken and stored faster than they are broken down (metabolized) or excreted”
  3. 3. Types of Bioaccumulation
  4. 4. Factors Affecting Bioaccumulation
  5. 5. Examples 1. DDT (Dichlorodiphenyltrichloroethane) Mr. Paul MullerDDT Mrs. Rachel Carson
  6. 6. 2. Heavy Metals 3. Polychlorinated biphenyls (PCB)
  7. 7. Sources of chemical pollutants that are Bio accumulated
  8. 8. How to Avoid the Bio accumulation of Chemical Pollutants
  9. 9. THE END!!!