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The Lead Story: From Natural to Unnatural State

Explore the atmospheric lead levels in the natural state derived from rock weathering, with examples like the Younger Dryas period. Discover the impact of lead in the air due to petrol, industrial processes, soil tillage, and lead mining, exceeding natural flux significantly.

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The Lead Story: From Natural to Unnatural State

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  1. Atmospheric Lead A Success Story

  2. The Natural State • Soil dust aerosols derived from rock weathering • 0.010 ± 0.002 mg//year with some variation caused by changes in source • For example: During the Younger Dryas(YD), background rates increased by a factor of 35

  3. The Unnatural State • Lead in Air • Petrol • Industrial Processes • Soil tillage and enhanced rates of soil erosion, thereby promoting the creation and release of soil dust • Lead Mining By 1979, the lead flux had reached 15.7 mg//year, exceeding the natural flux by a factor of more than 1500

  4. Pb EF (Pb levels normalized to Sc levels)

  5. Historic Lead Ratios (206Pb/207Pb)

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