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

Environmental Pollution
Inka ReijonenHelinä Hartikainen

Abstract

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 °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.

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Citations

Jul 15, 2016·Environmental Science and Pollution Research International·Muhammad ImtiazShuxin Tu
Apr 4, 2019·Environmental Science and Pollution Research International·Quan ZouMeng Yang
Dec 13, 2017·Proceedings of the National Academy of Sciences of the United States of America·William H SchlesingerAvner Vengosh
Oct 24, 2020·Journal of Hazardous Materials·Li ChenJin-Yan Yang
Dec 15, 2019·The Science of the Total Environment·Juliana A GalhardiKevin J Wilkinson
Mar 7, 2020·Environmental Science & Technology·Colton J Vessey, Matthew B J Lindsay

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