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Chemisch Weekblad

CHEM.WEEKBL.

1974/

70

8

M11; M12

M11; M12

0009-2932

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Lead has been used by man since earliest historical times. Its present day applications include batteries, roofing, water pipes and radioactive shielding. Lead compounds are used in the paint industry, as additives to gasoline, in the glass industry, in type making and in pesticides. Lead can also be released in the atmosphere through natural means, such as forest fires and volcanic activity. Ten times as much lead arrives in the atmosphere from human activities, and the greatest part originates with the burning of gasoline. Lead exists in the atmosphere in particles. The concept of the Mass Equivalent Diameter (MED) used in measuring these particles is described as the fictitious diameter which is equivalent to the diameter of a pure spherical particle of a mass with the same falling speed as the particle in question. Mobility of these particles in exhaust gases is discussed. Lifetime in the atmosphere is also important, and appears to range from 20 to 40 days. Lead is also released into the soil and waters, and its concentration has increased sharply since World War II as a result of increased gasoline consumption on a world scale.

environmental health

LOOD IN HET MILIEU; WAAR KOMT HET VANDAAN EN WAT GEBEURT ERMEE?

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1974