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Soil solid-phase controls lead activity in soil solution.

S H Badawy1, M I D Helal, A M Chaudri

  • 1Soil Science Dep., Faculty of Agriculture, Cairo Univ., Giza, Egypt. sbadawy4@hotmail.com

Journal of Environmental Quality
|February 14, 2002
PubMed
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Lead (Pb) pollution in soil is a significant environmental concern. This study found that lead activity in Egyptian soils is negatively correlated with pH and may be regulated by a mix of lead carbonate and phosphate minerals.

Area of Science:

  • Environmental Science
  • Soil Chemistry
  • Geochemistry

Background:

  • Lead (Pb) pollution is a pervasive environmental issue linked to human civilization.
  • While naturally present in soil, elevated lead levels in food crops are undesirable due to chronic health effects in humans and animals.
  • The chemical speciation and behavior of lead in soils remain incompletely understood.

Purpose of the Study:

  • To determine the activity of lead ions (Pb2+) in various Egyptian soil types (alluvial, desertic, calcareous).
  • To investigate the relationship between lead activity and soil properties, particularly pH.
  • To assess the solubility of lead minerals in relation to measured lead activities in soil solutions.

Main Methods:

  • Utilized the competitive chelation method to measure Pb2+ activity in near-neutral and alkaline soils.

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  • Collected soil and soil solution samples from representative Egyptian soil types.
  • Constructed solubility diagrams using thermodynamic data and compared them with measured Pb2+ activities.

    • Main Results:

    • Lead activity in the studied soils ranged from 10⁻⁶·⁷³ to 10⁻⁴·⁸³ M.
    • A significant negative correlation was observed between Pb2+ activity and soil/soil solution pH (R² = -0.92 and R² = -0.89, respectively).
    • The equation log(Pb2+) = 9.9 - 2pH was derived to predict lead activity in soil solution.
    • Measured Pb2+ activities indicated supersaturation with respect to lead carbonate and phosphate minerals, but undersaturation with lead silicate minerals.
    • Lead activity was not solely regulated by a single known mineral but possibly by a combination of lead carbonate and phosphate minerals.

    Conclusions:

    • Soil pH is a critical factor controlling lead activity in near-neutral to alkaline soils.
    • Lead speciation in these Egyptian soils is likely governed by a mixture of lead carbonate and phosphate minerals, rather than a single mineral phase.
    • Further research is needed to fully elucidate the specific mineralogical controls on lead solubility and speciation in diverse soil environments.