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CH3041
ON-LINE LECTURE 33
LEAD
• Lead is produced from Pb, Zn & Ag mines.
• Free lead metal is generally not a big problem, b.p. 1740oC & low vap.
pressure.
• Produced at around 33.2
x 106 t y-1
Natural environment mobilises 12 x 103 t y-1
Natural environment mobilises 12 x 103 t y-1
• Lead is mainly used in lead-acid storage
batteries (40%) and lead alkyl compounds used in leaded petrol (‘undeveloped’ places).
Africa phase out possible 2005.
batteries (40%) and lead alkyl compounds used in leaded petrol (‘undeveloped’ places).
Africa phase out possible 2005.
• Oxidation states
: 0, +2, +4
• The Pb from leaded petrol combustion has dispersed all over the globe as
75% of the Pb combusted was released as PbO
aerosol.
