Preconcentration of antimony by using of nano-adsorbent and determination by electrothermal atomic absorption spectrometry

In this paper, we report a simple and sensitive solid phase extraction system for the preconcentration of Sbions and determination by electrothermal atomic absorption spectrometry. The ion pair consisting of SbCl4− anion andthe benzyldimethyltetradecyl ammonium cation was formed on the surface of multi-walled carbon nanotubes, then elutedwith nitric acid, and the antimony content finally quantified by ETAAS. Several chemical and flow variables were studiedand optimized for a quantitative preconcentration and determination of Sb(III). At the optimized conditions, a linearcalibration graph was obtained over the concentration range of 3.0-45.0 ng mL−1 in final solution. The limit of detection(3sb) was found to be 4.0 ng L−1. The relative standard deviation (n = 3) at 100 ng L−1 of Sb(III) is 6.5%. This methodcould be applied for determination of trace amounts of Sb(III) in human hair and certified reference materials withsatisfactory results

Keywords:

Carbon nanotubes , Antimony , Solid phase extraction