Lead in the environment - origins, pathways and sinks

Environmental Quality and Safety. Supplement

|January 1, 1975

Summary

Lead is naturally present in the environment, with urban lead pollution primarily from paint and gasoline. While soil lead doesn

Area of Science:

Background:

Lead is a naturally occurring environmental element.
Urban lead contamination often stems from weathered house paint and leaded gasoline combustion.
Soils and sediments act as the primary long-term reservoirs for environmental lead.

Purpose of the Study:

To investigate the sources and environmental fate of lead.
To assess the impact of environmental lead on food and crop contamination.
To determine the relationship between lead concentrations in soil, air, and plants.

Main Methods:

Review of environmental lead sources, including paint weathering and gasoline combustion.
Analysis of lead content in food, soil, air, and plant tissues.
Evaluation of lead deposition from air and precipitation onto crops.

Main Results:

Average daily lead intake for humans is approximately 300 micrograms.
Elevated soil lead levels do not significantly increase lead in most plant tissues, except for leafy parts near highways.
Atmospheric lead concentrations have a negligible impact on the lead content of edible plant portions, and rainwater is not a major source of lead in crops.

Conclusions:

Environmental lead contamination is primarily linked to anthropogenic sources in urban settings.
Plant uptake of lead is minimal, with localized exceptions for leafy greens near high-traffic areas.
Current lead levels in air and from rainwater do not pose a significant risk to crop lead content.

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