RESUMO
In the presented work, alpha-benzoin oxime immobilized SP70 chelating resin was synthesized for separation and preconcentration of Pb(II), Cd(II), Co(II) and Cr(III). The optimization procedure for analytical parameters including pH, eluent type, flow rate, etc. was examined in order to gain quantitative recoveries of analyte ions. The effects of foreign ions on the recoveries of studied metal ions were also investigated. The detection limits (3sigma) were found to be 16.0, 4.2, 1.3, 2.4microgL(-1) for Pb, Cd, Co and Cr, respectively. The preconcentration factor was 75 for Pb, 100 for Cd, Co and Cr. The optimized method was validated with certified reference materials and successfully applied to the waters, crops and pharmaceutical samples with good results (recoveries greater than 95%, R.S.D. lower than 10%).
Assuntos
Benzoína/análogos & derivados , Quelantes/química , Poluentes Ambientais/isolamento & purificação , Resinas de Troca Iônica/química , Metais Pesados/isolamento & purificação , Oximas/química , Benzoína/síntese química , Benzoína/química , Quelantes/síntese química , Poluentes Ambientais/química , Concentração de Íons de Hidrogênio , Resinas de Troca Iônica/síntese química , Íons/química , Íons/isolamento & purificação , Metais Pesados/química , Oximas/síntese química , Espectrofotometria AtômicaRESUMO
A simple and sensitive method for the speciation, separation and preconcentration of Cr(VI) and Cr(III) in natural water, soil and sediment samples was developed. Cr(VI) has been separated from Cr(III) and preconcentrated as Cr(III)-diphenylcarbazone complex by using Ambersorb 563 resin and determined by spectrophotometric method at 540 nm. Effect of analytical parameters such as sulfuric acid concentration, ligand volume, type of elution solution, sample volume, amount of resin and foreign ions were investigated. The presented procedure was successfully applied for the chromium speciation in various environmental samples with successfully results.