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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 Nb 2 O 5 –SiO 2 allowed the selective separation of Cr(III) from Cr(VI) in the pH range of 6–9. Thus, a method for Cr(III) preconcentration and extraction...
An on-line preconcentration system for zinc determination in 24-h urine, blood plasma and erythrocyte matrices by flame atomic absorption spectrometry (FAAS) was used. This procedure was based on adsorption of Zn(II) ions onto a minicolumn filled with silica gel, chemically modified with niobium(V) oxide (Nb 2 O 5 –SiO 2 ). The determination of the optimum conditions for Zn(II)...
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