Application of XANES spectroscopy to investigate Sb species in corroded bullets crust material oriented to evaluate the potential toxic effects in the environment

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EarlyView Article

  • Published: Dec 13, 2017
  • Author: Marcelo Rubio, María F. Mera, Carlos A. Pérez, Flavio C. Vicentin
  • Journal: X-Ray Spectrometry

Lead, antimony, and other toxic metals from pellets alloy are dispersed in the soil of the shooting fields. As long as the corroding bullets are present in soil, secondary Pb and Sb phases appear in the weathering crusts being an important source of bioavailable Pb and Sb. Knowledge about the corrosion mechanism of Sb from the bullet is limited, and reports on Sb speciation in crust and soils are still scarce. Considering that Sb species have different toxicological properties in the environment, this work has focused attention in X‐ray Absorption Near Edge Structure measurements at the Sb L‐edges in order to identify its chemical speciation in crust (Sb(0), Sb(III), and Sb(V)).

X‐ray Absorption Near Edge Structure measurements were carried out at the D04A Soft X‐ray Spectroscopy beamline at the LNLS. Samples consisted of dust crust taken from physically deformed and strongly corroded metallic bullets retained in soil samples sieving from shooting fields of the North and East region of Córdoba, Argentina.

The results showed that the main species found in all samples were Sb(V)(Sb2O5) followed by Sb(0) (metallic). Sb(III) was not observed, and it is known that Sb(III) is more toxic than Sb(V). The results suggested that in these environmental conditions, pentavalent Sb was the predominant species after weathering of metallic Sb from corroding bullets.

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