Magnetic Nanoparticles Coated with Ionic Liquid as a Sorbent for Solid Phase Extraction of Chromium(VI) Prior to Its Determination by Electrothermal Atomic Absorption Spectrometry

AUTOR(ES)

Karimi, Mehdi, Shabani, Ali M. H., Dadfarnia, Shayessteh

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2016-01

RESUMO

A simple, sensitive and reliable method for the separation, preconcentration and determination of ultra trace amounts of chromium species has been developed. Chromium(VI) in aqueous sample was reacted with 9-phenyl-2,3,7-trihydroxy-6-fluorone to produce a chelate at pH of 5.0 and extracted onto the magnetic nanoparticles coated with the ionic liquid 1-hexadecyl-3- methylimidazolium bromide. The trapped analyte was back extracted using 350 µL of nitric acid solution (2 mol L-1) and was determined by electrothermal atomic absorption spectrometry. Total chromium was determined by oxidizing CrIII to CrVI using KMnO4 in acidic media. Under the optimum conditions, the method exhibited a linear dynamic range of 0.01-0.50 µg L-1 with an enhancement factor of 112 and a detection limit of 0.003 µg L-1 for CrVI. The coefficient of variation (n = 6) at 0.3 µg L-1 concentration level of CrVI was 3.2%.

Documentos Relacionados

• STUDY OF THE CHROMIUM(VI) REMOVAL FROM AQUEOUS SYSTEMS BY COBALT NANOPARTICLES
• Reduction of trace quantities of chromium(VI) by strong acids
• Removal of Chromium(VI) from Industrial Effluents Through Supported Liquid Membrane Using Trioctylphosphine Oxide as a Carrier
• Dispersive liquid-liquid microextraction based on solidification of floating organic drop for simultaneous separation/preconcentration of nickel, cobalt and copper prior to determination by electrothermal atomic absorption spectrometry
• Solid-phase extraction of Cu(II) using polyurethane foam and eriochrome black T as ligand for its determination in waters by flame atomic absorption spectrometry