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An optimised sequential extraction scheme for the evaluation of vanadium mobility in soils.

  • Xu YH Department of Evolutionary Biology and Environmental Studies, University of Zurich, CH-8057 Zurich, Switzerland. Electronic address: yuhui.xu@ieu.uzh.ch.
  • Huang JH Environmental Geosciences, University of Basel, CH-4056 Basel, Switzerland. Electronic address: jen-how.huang@unibas.ch.
  • Brandl H Department of Evolutionary Biology and Environmental Studies, University of Zurich, CH-8057 Zurich, Switzerland.
  • 2017-04-05
Published in:
  • Journal of environmental sciences (China). - 2017
Iron and aluminium (hydr)oxides
Mobility
Sequential extraction
Soil
Vanadium
Adsorption
Agriculture
Chemical Fractionation
Environmental Monitoring
Minerals
Soil
Soil Pollutants
Vanadium
English Reviewing the current state of knowledge about sequential extraction applied for soil vanadium (V) fractionation, we identified an urgent requirement of an sequential extraction (SE) specified for V. Namely, almost all previous SE extracted only 8.4%-48% of total V in soils (excluding residue). Thus, we proposed an eight-step SE for V fractionation in soils according to the knowledge gained from literature and our own dissolution experiments with model minerals. After extracting the mobilisable and adsorbed V with de-ionised water and 5mmol/L phosphate, 1mol/L pyrophosphate was applied to gather organic matter bound V which minimised the artefact dissolving Al and Fe (hydr)oxides occurred when using HNO3-H2O2 for extraction. Extraction with 0.4mol/L NH2OH⋅HCl was highly selective toward manganese oxides. Fractionation of different crystalline Al and Fe (hydr)oxides associated V with 1mol/L HCl, 0.2mol/L oxalate buffer and 4mol/L HCl at 95°C especially improved the extractability of V incorporated with crystalline phase associated V. The suitability of our new SE scheme was confirmed by its higher selectivity against the target phases and higher extraction efficiencies (55%-77% of total V) with model minerals and 6 soils of different properties than previous SE.
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  • English
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https://sonar.ch/global/documents/191265
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