2. SOME METAL IONS ARE GOOD!
Fe2+, K+, Ca2+, Mg2+
Essential to the health of humans.
May be in water but mostly get in food we
eat.

3. HEAVY METAL IONS ARE HARMFUL!
Lead- Pb2+
Mercury- Hg2+
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