Impact of soil pH and organic matter on the chemical bioavailability of vanadium species: the underlying basis for risk assessment

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The main objective of this study was to unravel the chemical reactions and processes dictating the potential bioavailability of vanadium (V). In environmental solutions V exists in two stable oxidation states, +IV and +V, of which +V is considered to be more toxic. In this study, the effect of speciation and soil pH on the chemical accessibility of V was investigated with two soils: 1) field soil rather rich in soil organic matter (SOM) and 2) coarse mineral soil low in SOM. Fresh soil samples treated with V(+V) (added as NaVO3) or V(+IV) (added as VOSO4) (pH adjusted to the range 4.0-6.9) were incubated for 3 months at 22 degrees C. The adsorption tendency of V species was explored by water extraction (Milli-Q water, 1:50 dw/V) and by sequential extraction (0.25 M KCl; 0.1 M KH2/K2HPO4; 0.1 M NaOH; 0.25 M H2SO4, 1:10 dw/V). The potential bioavailability of V was found to be dictated by soil properties. SOM reduced V(+V) to V(+IV) and acted as a sorbent for both species, which lowered the bioaccessibility of V. A high pH, in turn, favored the predominance of the V(+V) species and thus increased the chemical accessibility of V. (C) 2016 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalEnvironmental Pollution
Pages (from-to)371-379
Number of pages9
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 1172 Environmental sciences
  • Bioavailability
  • Vanadium
  • Soil
  • Speciation
  • Chemistry
  • ACID
  • IRON

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