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Updated: Dec 31, 2025
12:03
Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
Published on: September 1, 2020
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Evaluating vanadium bioavailability to cabbage in rural soils using geochemical and micro-spectroscopic techniques
Cho-Yin Wu1, Maki Asano2, Yohey Hashimoto3
1Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan.
Environmental Pollution (Barking, Essex : 1987)
|January 9, 2020
Summary
This study shows that sodium bicarbonate (NaHCO3) extraction effectively predicts vanadium bioavailability in soils, correlating well with plant uptake. This method can help assess soil vanadium mobility and plant accumulation.
Area of Science:
- Environmental Science
- Soil Science
- Geochemistry
Background:
- Vanadium (V) bioavailability in soils is crucial for understanding its environmental fate and plant uptake.
- Predicting vanadium mobility and bioavailability requires integrated geochemical and spectroscopic approaches.
- Limited studies have combined geochemical extractions and micro-spectroscopic techniques for vanadium assessment.
Purpose of the Study:
- To determine vanadium bioavailability in Taiwanese rural soils.
- To evaluate single extractants and sequential extraction procedures for predicting vanadium mobility.
- To assess vanadium speciation using X-ray absorption near edge structure (XANES) spectroscopy.
Main Methods:
- Collected 94 soil samples from 17 profiles in Taiwan.
- Utilized BCR sequential extraction and four single extractants (CaCl2, HCl, EDTA, NaHCO3) for V fractionation.
- Employed vanadium K-edge XANES spectroscopy for V speciation and Electron Probe Micro Analysis (EPMA) for elemental composition.
Main Results:
- Vanadium predominantly resided in the residual fraction (81-98%), with mobile fractions associated with Fe oxides.
- XANES analysis revealed vanadium existed mainly as V(IV) and V(V) species.
- NaHCO3 extraction showed a significant positive correlation with total soil V and plant shoot concentrations, suggesting it as a reliable bioavailability index.
Conclusions:
- Sodium bicarbonate (NaHCO3) extraction is a promising index for assessing soil vanadium bioavailability.
- Vanadium bioavailability is influenced by soil properties like total V content, cation exchange capacity (CEC), and pH.
- Further research is needed to validate these findings across diverse soil types and plant species.
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