Abstract

WELNA, Maja; LASOWSKA, Joanna  and  ZYRNICKI, Wieslaw. Determination of some inorganic species of Fe, Mn and Cr by chemical vapor generation hyphenated with inductively coupled plasma atomic emission spectrometry. J. Braz. Chem. Soc. [online]. 2011, vol.22, n.6, pp. 1164-1169. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532011000600023.

Generation of volatile species (CVG) from Fe²⁺, Fe³⁺, Cr³⁺, CrO₄²ˉ, Mn²⁺ and MnO₄ˉ ions by reaction with NaBH₄ reductant in HCl, CH₃COOH and citric acids using gas-liquid phase separation system and inductively coupled plasma atomic emission spectrometry detection (ICP OES) was reported. The optimized conditions were obtained using low concentrations of HCl (0.05‑0.075 mol L^‑1) and NaBH₄ (0.25-1.0% (m/v)). Volatile species were more effectively generated for lower oxidation state of the analytes. Detection limits of 10, 25 and 66 ng mL^-1 were achieved for Mn²⁺, Fe²⁺ and Cr³⁺, respectively.

Keywords : chemical vapor generation; transition metals; speciation forms; inductively coupled plasma optical emission spectrometry.