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Using modified Tessier sequential extraction to specify potentially toxic metals at a former sewage farm
Magdalena Sut-Lohmann1, Shaghayegh Ramezany1, Friederike Kästner2
1Brandenburg University of Technology Cottbus-Senftenberg, Chair of Geopedology and Landscape Development, Siemens-Halske-Ring 8, 03046, Cottbus, Germany.
Journal of Environmental Management
|December 18, 2021
Summary
This study assessed metal mobility in former sewage farm soil using sequential extraction and FTIR analysis. Results show varying metal fractions and mobility, with Ni and Zn being most mobile, and FTIR confirming extraction impacts.
Area of Science:
- Environmental Science
- Geochemistry
- Analytical Chemistry
Background:
- Former sewage farm soils can accumulate heavy metals.
- Understanding metal mobility is crucial for environmental risk assessment.
Purpose of the Study:
- To evaluate the mobility of Copper (Cu), Zinc (Zn), Lead (Pb), Chromium (Cr), and Nickel (Ni) in soil.
- To analyze functional group changes during sequential extraction using Fourier-Transform Infrared (FTIR) spectroscopy.
- To assess metal fractionation and mobility in a former sewage farm sedimentation basin.
Main Methods:
- Modified Tessier sequential extraction procedure was employed to fractionate metals.
- Fourier-Transform Infrared (FTIR) analysis, specifically Diffuse Reflectance Infrared Fourier Transform (DRIFT), was used to study functional group changes.
- Metal concentrations in different soil fractions were quantified.
Main Results:
- Lead (Pb) and Chromium (Cr) were predominantly found in the residual fraction, while Copper (Cu) was mainly bound to organic matter (OM).
- Zinc (Zn) and Nickel (Ni) showed a higher affinity for the Iron/Manganese (Fe/Mn) oxide fraction.
- The mobility order was determined as Ni > Zn > Cu > Pb/Cr, with recovery rates ranging from 62% to 111%.
Conclusions:
- Sequential extraction and FTIR are effective methods for studying metal mobility and soil functional group changes.
- The soil exhibits element-dependent metal fractionation and varying mobility, indicating potential environmental risks.
- FTIR analysis successfully correlated spectral changes with specific extraction fractions (carbonate, Fe/Mn oxides, OM).
Keywords:
Atomic absorption spectroscopyFourier-transform infrared spectroscopyHeavy metalsSewage farmingMore Related Videos
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