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Published on: March 24, 2023
Sample drying effects on lead bioaccessibility in reduced soil.
Olha Furman1, Daniel G Strawn, Steve McGeehan
1Dep. of Plant, Soil, and Entomological Sciences, Univ. of Idaho, Moscow, ID 83844-2339, USA.
Journal of Environmental Quality
|May 9, 2007
Summary
Drying wetland soils before testing can alter lead (Pb) bioavailability measurements. Wet soil samples provide more accurate bioaccessibility data for risk assessment and remediation planning.
Area of Science:
- Environmental Science
- Geochemistry
- Toxicology
Background:
- Contaminated wetland soils pose environmental risks.
- Standard risk assessment protocols may artificially oxidize soils.
- Soil oxidation can alter contaminant bioavailability, leading to inaccurate assessments.
Purpose of the Study:
- To investigate the impact of soil oxygenation on lead (Pb) bioaccessibility.
- To determine if drying methods affect Pb bioavailability measurements in wetland soils.
Main Methods:
- Collected submerged wetland soil from the Coeur d'Alene River floodplain.
- Utilized a waterfowl physiologically based extraction test (W-PBET) to measure Pb bioaccessibility.
- Compared Pb bioaccessibility in wet, air-dried, and freeze-dried soil samples.
Main Results:
- Wet soil samples exhibited lower Pb bioaccessibility than air-dried or freeze-dried samples.
- Air-drying led to decreased Fe extractability and increased Mn extractability.
- Redox conditions significantly influenced Pb bioavailability.
Conclusions:
- Soil drying and oxidation alter Pb bioaccessibility measurements.
- Accurate risk assessment of Pb in reduced wetland soils requires consideration of redox conditions.
- Methodological choices in soil sample handling impact contaminant bioavailability data.
