1. Bioaccumulation
2.3 part 2 of 2

2. Agenda Powerpoint to finish up 2.2 Case study – DDT Finish notes
Video on BP oil Spill
Video on Bioremediation
Work on 2.3 / Practice problems

3. Persistent Organic Pollutants (P.O.P.)
P.O.P.’s are carbon based compounds
Remain in water/soil for a long time
Typically, sprayed as insecticide

4. Examples of P.O.P.
PCB
DDT

5. Dichloro-diphenyl trichloroethane (DDT)
Introduced to control disease carrying mosquitos
Has a long half life  bioaccumulates
Can cause nervous, immune and reproductive disorders at 5ppm!
Spraying DDT, 1958

6. Heavy Metals Metallic elements that are toxic to organisms
Examples: Lead, Cadmium and Mercury

7. Lead Naturally found in soil Nowadays, it is found in electronics
Extremely toxic!

8. Cadmium Humans used them for plastics and nickel-cadmium batteries
Those who smoke are at higher risks since tobacco easily absorbs cadmium = lung diseases

9. Mercury
Human activity has increased it by burning fossil fuels, mining and making batteries
Mercury tends to bioaccumulate in the brain, heart and kidneys

10. Reducing the effects of chemical pollution
Bioremediation: using micro-organisms or plants to clean up toxic chemicals
Example: oil industries use bacteria to clean up oil spills