1. HEAVY METAL IONS

2. SOME METAL IONS ARE GOOD! Fe 2+, K +, Ca 2+, Mg 2+ Essential to the health of humans. May be in water but mostly get in food we eat.

3. HEAVY METAL IONS ARE HARMFUL! Lead- Pb 2+ Mercury- Hg 2+ 1)Bind to proteins preventing them from doing their intended tasks 2)Damage to nervous system, brain, kidneys, and liver

4. LEAD (PB) Sources in environment: 1)Paint- most paints no longer contain lead 2)Automobile batteries 3)Leaded gasoline until 1970’s 4)Lead pipes in older homes

6. MERCURY Sources in environment; 1)Fluorescent light bulbs 2)Medical thermometers 3)Formally used in antiseptics and pesticides

8. MAD HATTER- DUE TO MERCURY POISONING