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Soluble metal pool as affected by soil addition with organic inputs
Maria C Hernandez-Soriano1, Aránzazu Peña, Maria Dolores Mingorance
1Division of Soil and Water Management, University of Leuven, Heverlee, Belgium. maria.HernandezSoriano@ees.kuleuven.be
Environmental Toxicology and Chemistry
|February 13, 2013
Summary
Adding organic matter to soil affects metal mobility, with increased movement at field capacity but decreased movement under saturation. Metal bioavailability is linked to metal-organic matter complexes and soil organic matter content.
Area of Science:
- Environmental Chemistry
- Soil Science
- Geochemistry
Background:
- Organic matter inputs significantly influence soil metal behavior.
- Understanding metal mobility and bioavailability is crucial for environmental risk assessment.
Purpose of the Study:
- To investigate the impact of diverse organic matter inputs on metal mobility and bioavailability.
- To assess the effects of different soil moisture regimes on metal behavior.
Main Methods:
- Laboratory-scale incubation of three soils with hay, maize straw, and peat.
- Analysis of soil solution for total soluble metals, dissolved organic carbon, and UV absorbance.
- Speciation analysis using Weighted-Average Hydrolysis and Metal-ion Interaction (WHAM VI).
Main Results:
- Organic matter addition increased metal mobility (Pb>Cu>Zn>Cd) under field capacity, correlated with dissolved organic matter.
- Metal bioavailability decreased with increased metal-organic matter complexation and aromatic organic matter.
- Soil saturation reduced metal mobility, metal-organic matter complexes, and organic matter solubilization.
Conclusions:
- Organic matter type and soil moisture critically control metal mobility and bioavailability.
- Metal-organic matter complexation plays a key role in reducing metal bioavailability.
- Al mobilization and pH are significant drivers of organic matter solubilization and subsequent metal mobility.
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