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CH3041
HEAVY METALS
The heavy metals occur near
the bottom of
the periodic table and have a high density
compared with a light metal such as Al (2.7).
the periodic table and have a high density
compared with a light metal such as Al (2.7).
• We will focus on two environmentally important
toxic heavy metals :
Hg (r 13.5) and Pb (r 11.3 g/cm3)
Hg (r 13.5) and Pb (r 11.3 g/cm3)
• Lead crust :
12ppm, oceans 0.03ppb
the main ore is galena PbS.
the main ore is galena PbS.
• Mercury crust : 80ppb, oceans 0.15ppb
the main ore is cinnabar HgS.
the main ore is cinnabar HgS.
