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natural concentration of lead in plantsl

Soil Lead Contamination Lead is naturally present in all soils It generally occurs in the range of 15 to 40 parts lead per million parts of soil ppm or 15 to 40 milligrams lead per kilogram of soil mgkg Pollution can increase soil lead levels to several thousand ppm The major cause of soil lead contamination in populated areas is the weathering chipping scraping sanding and sand

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