Fossil Fuel Combustion

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In general, fossil fuel combustion results in the dispersion of a wide range of heavy metals, which can include: Pb, Cd, Cr, Zn, As, Sb, Se, Ba, Cu, Mn, U, and V, over a very large area, although not all these elements are present in significant concentrations in all types of coal and petroleum. The metals accumulate in the coal and petroleum deposits as they formed and are either emitted into the environment as airborne particles during combustion or accumulated in the ash which may itself be transported and contaminate soils or waters or may be leached in situ. The combustion of petrol (gasoline) containing Pb additives has been the largest source of this metal in this environment and has affected soils over a high proportion of the earth's terrestrial surface. Pb is emitted in the exhaust of vehicles running on Pb containing petrol as aerosol particles 0.01-0.1 mm in diameter, but these primary particles can cluster to form large particles (0.3-1 mm). These particles comprise mainly PbBrCl but can react with other air pollutants to form more complex compounds such as a-2PbBrCl NH4Cl.

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Guide to Alternative Fuels

Guide to Alternative Fuels

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