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Preconcentration trace amount Co(II) by carbon nanotubes in water samples and determination it by FAAS


Ali Moghimi

Page No. 55-64


Abstract

A simple method has been developed for the preconcentration of Co(II) based on the adsorption of
its Schiff’s Naphtol-2-(Pyridylazo-2)-1 (PAN) complex on a Single walled carbon nanotubes
(SWCNTs) onto C18 cartridge . The influence of acidity, eluting agents, stability of the cartridge,
sample volume and interfering ions has been investigated in detail. The adsorbed complex could be
eluted using HNO3 4M and the concentration of Co(II) was determined by flame atomic adsorption
spectrometry (FAAS). A detection limit of 0.10 μgL-1 could be achieved and the developed
procedure was successfully applied for the determination of Co(II) in spiked water samples . The
preconcentration factor attainable for quantitative recovery (>97%) of Co(II) was 125 for a
1000mL sample volume. The mentioned method was successfully applied on the determination of
Co(II) in different water samples. In this method, relative standard deviation (RSD) is %1.25.
Keywords: Co(II), Preconcentration, Solid phase extraction, Single walled carbon nanotubes
(SWCNTs). Flame atomic adsorption spectrometry (FAAS).


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