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An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils.
Yu-Hui Xu1, Jen-How Huang2, Helmut Brandl1
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, CH-8057 Zurich, Switzerland.
Journal of Environmental Sciences (China)
|April 5, 2017
Summary
A new eight-step sequential extraction (SE) method was developed for soil vanadium (V) fractionation. This method improves V extraction efficiency and selectivity compared to previous techniques.
Area of Science:
- Environmental Chemistry
- Soil Science
- Geochemistry
Background:
- Existing sequential extraction (SE) methods show low efficiency for soil vanadium (V) fractionation, extracting only 8.4%-48% of total V.
- A specific and efficient SE method for V is urgently needed for accurate soil V speciation.
Purpose of the Study:
- To develop and validate a novel eight-step sequential extraction (SE) scheme for precise soil vanadium (V) fractionation.
- To improve the selectivity and extraction efficiency of V from different soil matrices.
Main Methods:
- Proposed an eight-step SE method based on literature review and dissolution experiments with model minerals.
- Employed de-ionised water, phosphate, pyrophosphate, hydroxylamine hydrochloride, and varying concentrations of HCl and oxalate buffer for sequential V extraction.
- Tested the new SE scheme on model minerals and six diverse soil samples.
Main Results:
- The new SE scheme demonstrated higher selectivity for target soil V fractions.
- Extraction efficiencies ranged from 55% to 77% of total V, significantly higher than previous methods.
- The method effectively fractionated mobilizable, adsorbed, organic matter-bound, manganese oxide-bound, and crystalline phase-associated V.
Conclusions:
- The developed eight-step SE is a more effective and selective method for soil vanadium (V) fractionation.
- This improved method provides a more accurate assessment of V mobility and bioavailability in soils.