Speciation of Cr(III) and Cr(VI) in environmental samples determined by selective separation and preconcentration on silica gel chemically modified with niobium(V) oxide.

@article{Martendal2009SpeciationOC,
  title={Speciation of Cr(III) and Cr(VI) in environmental samples determined by selective separation and preconcentration on silica gel chemically modified with niobium(V) oxide.},
  author={Edmar Martendal and Helo{\'i}sa França Maltez and Eduardo Carasek},
  journal={Journal of hazardous materials},
  year={2009},
  volume={161 1},
  pages={450-6}
}
In this study a new method for chromium speciation in water using solid phase extraction coupled to a flow injection system and flame atomic absorption spectrometry was developed. The adsorption behavior of Cr(III) and Cr(VI) on Nb2O5-SiO2 allowed the selective separation of Cr(III) from Cr(VI) in the pH range of 6-9. Thus, a method for Cr(III… CONTINUE READING